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HKCEE Chemistry Multiple Choices

CONTENTS

Section 1 Planet Earth

1.1 The atmosphere P.1

1.2 The ocean P.2

1.3 Rocks and minerals P.3

Section 2 The Microscopic World

2.1 Atomic structure P.4-13

2.2 Periodic Table P.14-17

2.3 Ionic and covalent bonding P.18-24

2.4 Structures and properties P.25-28

Section 3 Metals

3.1 Extraction and the uses of metals P.29-31

3.2 Reactivity of metals P.32-37

3.3 Reacting masses P.38-44

3.4 Corrosion of metals and their protection P.45-47

Section 4 Acids and alkalis

4.1 Acids P.48-54

4.2 Alkalis P.55-57

4.3 Neutralization and salts P.58-60

4.4 Concentration of solutions P.61-64

4.5 Simple volumetric work P.65-68

4.6 Rate of Reaction P.69-73

Section 5 Chemical Cells and Electrolysis

5.1 Chemical cells in daily life P.74

5.2 Simple chemical cells P.75-80

5.3 Redox reactions P.81-91

5.4 Electrolysis P.92-97

Section 6 Products from Important Processes

6.1 Chlorine and hypochlorite P.98-103

6.2 Sulphuric acid and sulphur dioxide P.104-114

6.3 Molar volume of gases P.115-119

Section 7 Fossil Fuels and of Carbon Compounds

7.1 Fossil fuels P.120-121

7.2 Homologous series, structural formulae

and carbon compounds P.122-124

7.3 Alkanes and alkenes P.125-132

7.4 Consequences of using fossil fuels P.133-138

7.5 Alkanol, alkanoic acid and ester P.139-148

Section 8 Plastics and detergents

8.1 Plastics P.149-156

8.2 Detergents P.157-162

Section 9 Detection and analysis

9.1 Separation of mixtures P.163-165

9.2 Tests for substances P.166-169

Multiple-Choices Answers (By Topics) P.170-174

Multiple-Choices Answers (By Years) P.175

1

1. 2005/II/3

The table below gives some information about certain components in a sample of liquefied air.

Component Boiling Point °C

Argon -186

Nitrogen -196

Oxygen -183

In what order are these components distilled out when the sample undergoes fractional distillation?

A. nitrogen, oxygen, argon B. nitrogen, argon, oxygen

C. oxygen, argon, nitrogen D. oxygen, nitrogen, argon

2. 2005/II/20

Which of the following substances is most stable in moist air?

A. Ca B. Fe C. SiO2 D. SO2

3. 2005/II/28

Which of the following process affect the amount of carbon dioxide in the atmosphere?

(1) burning of fossil fuels (2) photosynthesis in plants (3) absorption by sea water

A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

4. 2006/II/4

Which of the following combinations concerning the change of physical state of a substance is INCORRECT?

Change of physical state Process

A. liquid to gas evaporation

B. liquid to solid precipitation

C. solid to gas sublimation

D. gas to liquid condensation

5. 2008/II/8

Nitrogen, instead of air, is used to fill the packets of potato chips. It is because

A. air supports combustion but nitrogen dose not

B. the density of air is higher than the nitrogen

C. argon in air contaminates the chips but nitrogen does not

D. oxygen in air makes the chips go bad but nitrogen does not

HKCEE CHEMISTRY | 1.1 The atmosphere | P.1

2

1. 2005/II/25

Which of the following processes involve chemical changes?

(1) mixing sea water with silver nitrate solution

(2) evaporation of sea water

(3) electrolysis of sea water

A. (1) and (2) only

B. (1) and (3) only

C. (2) and (3) only

D. (1),(2) and (3)

HKCEE CHEMISTRY | 1.2 The ocean | P.1

3

1. 2006/II/25

Which of the following substances contain calcium carbonate as the main chemical constituent?

(1) limestone

(2) chalk

(3) marble

A. (1) and (2) only

B. (1) and (3) only

C. (2) and (3) only

D. (1),(2) and (3)

2. 2008/II/42

Calcium carbonate can be obtained from quicklime through two processes as shown below.

Process 1 Process 2

quicklime limewater calcium carbonate→ →

Which of the following combinations is correct?

Process 1 Process 2

A. adding water adding Na2CO3 (aq)

B. adding Na2CO3 (aq) adding water

C. adding water heating

D. heating adding water

HKCEE CHEMISTRY | 1.3 Rock and minerals | P.1

4

1. 1990/II/2

A cation of a certain element has 22 electrons and a mass number of 55. If the charge on the cation is +3, the

number of neutrons in the cation is

A. 19 B. 23 C. 25 D. 30

2. 1990/II/4

Which of the following combinations concerning the isotopes of an element is correct?

No. of protons No. of neutrons No. of electrons

A. same different same

B. same same different

C. different same different

D. same different different

3. 1990/II/26

Dry zinc chloride solid is a non-conductor of electricity because

A. it is a non-electrolyte B. it exists as molecules

C. its ions are not mobile D. metallic bonding is not present

4. 1991/II/1

Questions 4 and 5 refer to the following table.

Element W X Y Z

Atomic number 4 8 14 20

Which of the following elements are likely to be metals?

A. W and X B. W and Z C. X and Y D. Y and Z

5. 1991/II/2

The formula of the compound formed between X and Z is likely to be

A. XZ B. XZ2 C. X2Z D. X2Z3

6. 1991/II/4

Which of the following groups of ions/atoms has the same number of electrons?

A. K+, Ca

2+ B. Cl

- , S C. H

+ , He D. O

2- , Ar

7. 1992/II/30

The atomic number and mass number of element E are 8 and 17 respectively. What are the numbers of protons

and neutrons in an atom of E?

Number of protons Number of neutrons Number of protons Number of neutrons

A. 8 9 B. 8 17

C. 9 8 D. 9 17

HKCEE CHEMISTRY | 2.1 Atomic structure | P.1

5

8. 1992/II/45

1st statement 2nd statement

Both zinc and molten sodium chloride conduct electricity. Both zinc and molten sodium chloride contain

mobile ions.

9. 1993/II/1

Which of the following pairs of atoms/ions has the same number of electrons?

A. Mg2+

and F B. Cl and Ne C. K+ and O

2- D. Cl

- and S

2-

10. 1993/II/4

The element with atomic number 11 will combine most readily with the element whose atomic number is

A. 12 B. 13 C. 17 D. 18

11. 1994/II/2

Consider the information given in the table below:

Atom Atomic number Mass number No. of neutrons

P 6 14

Q 7 14

R 13 7

S 18 10

T 10 10

Which of the following atoms are isotopes?

A. P and Q B. P and R C. R and S D. S and T

12. 1994/II/3

Which of the following molecules has the greatest number of lone pair of electrons?

A. fluorine B. hydrogen C. nitrogen D. oxygen

13. 1995/II/1

The atomic number of an element X is 18. An atom of X has a mass number of 40.The atom has

A. 18 protons, 22 neutrons and 18 electrons B. 18 protons, 22 neutrons and 22 electrons

C. 18 protons, 40 neutrons and 18 electrons D. 22 protons, 22 neutrons and 18 electrons


6

14. 1995/II/4

Boron consists of two isotopes. The table below lists the relative abundance of these two isotopes.

The relative atomic mass of boron (correct to 1 decimal place) is

A. 10.4 B. 10.6 C. 10.8 D. 11.0

15. 1995/II/26

Which of the following elements is a semi-metal?

A. Hg. B. Si. C. C. D. Be.

16. 1995/II/34

Which of the following particles is/are present in a hydrogen ion?

(1) proton (2) neutron (3) electron

A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only

17. 1995/II/39

Which of the following substances can conduct electricity?

(1) molten zinc chloride (2) an aqueous solution of magnesium sulphate

(3) a mixture of ethanol and water

A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1),(2) and (3)

18. 1996/II/2

Which of the following can represent the electronic structure of potassium sulphide?

A. B. S

2-

K2

+

C. S

2-

K

2+

D. K S

19. 1996/II/3

The mass number of atom X is 27. X forms a cation with a charge of +3. If the number of neutrons in the cation

is 14, what is the number of electrons in the cation?

A. 10. B. 13. C. 14. D. 17

20. 1996/II/39

The atomic number of element X is 16.0. Which of the following statements concerning X are correct?

(1) X can react with calcium to form an ionic compound

(2) The oxide of X dissolves in water to form an acidic solution

(3) X can conduct electricity in its molten state


Isotope Relative abundance

B10

5 19.7%

B11

5 80.3%


7

21. 1996/II/42

X is an element, It can form a cation X2+

which has an electronic arrangement 2, 8, 8. Which of the following

statements concerning X are correct?

(1) X is a strong oxidizing agent

(2) X is in Period 4 of the Period Table

(3) X burns in oxygen with a brick red flame


22. 1996/II/50

1st statement 2

nd statement

Both dry ice and quartz exist in the form of Carbon and silicon atoms have the same

discrete molecules. number of electrons in their outmost shells.

23. 1997/II/1

The chemical properties of an element depend on

A. its relative atomic mass B. the number of isotopes of the element

C. the number of electron shells in its atoms D. the number of outermost shells electrons in its atoms

24. 1997/II/2

Elements X and Y form a compound having the following electronic structure :

Y YX

-- 2+

(Only outmost shell electrons are shown.)


X Y

A. Na S

B. Mg Br

C. Al Cl

D. Si O

25. 1998/II/1

An element X exists as molecules. X has an atomic number of 7 and a molecule of X has a formula X2 .

Which of the following can represent the electronic structure of X2 ?

A. X X

B. X X C. X X D. X X

26. 1998/II/18

Which of the following ions has the same number of protons as the hydroxide ion, OH-

A. O2-

B. F- C. Na

+ D. Mg

2+


8

27. 1999/II/1

Which of the following diagrams can represent a mixture of two compounds?

(In these diagrams , ● and ○ represent a nitrogen atom and an oxygen atom respectively.)

28. 1999/II/4

Element X and Element Y belong to the first three periods of the Periodic Table. The compound formed

between these two elements has the following electronic structure:

X+

X+

X+

Y

3-

(Only outermost shell electrons are shown.)

How many electrons are there in the outermost shell of an atom of X and that of Y?

X Y

A. 1 3

B. 1 5

C. 2 8

D. 3 5

29. 1999/II/5

Consider the information concerning particle X and particle Y listed below:

Particle Number of protons Number of electrons Number of neutrons

X 16 16 18

Y 16 18 18

Which of the following statements is correct?

A. X and Y are atoms of the same element B. X and Y are atoms of different element

C. X is a cation of Y D. Y is an anion of X


9

30. 1999/II/11

The table below shows the ability of four substances W, X, Y and Z to conduct electricity.

(In the table, � and � respectively represent ‘ can conduct electricity ’ and ‘ cannot conduct electricity’.)

Which of the substances is likely to be zinc chloride?

A. W B. X C. Y D. Z

31. 1999/II/39

Element X has an isotope 31

15 X. Which of the following statements is/are correct?

(1) X belongs to V of the Periodic Table

(2) X can react with oxygen to from an ionic compound

(3) 31

15 X has 16 neutrons

A. (1) only. B. (2) only. C. (1) and (3) only. D. (2) and (3) only.

32. 1999/II/46

1st statement 2

nd statement

Metals have good thermal conductivity. Metals are composed of giant lattices of positive ions

surrounded by valence electrons which are free to move

throughout the lattices.

33. 2000/II/1

A compound formed from element X and sulphur has the following electronic structure:

(Only electrons in the outermost shells are shown.)

How many electrons are there in the outermost shell of an atom of X?

A. 2 B. 4 C. 6 D. 8

34. 2000/II/7

Element X occurs in nature as two isotopes, 63

X and 65

X. If the relative atomic mass of X is 63.5, what is the

relative abundance of the 63

X isotope?

A. 25% B. 60% C. 75% D. 90%

Substance Solid State Liquid State Aqueous Solution

W � � �

X � � �

Y � � �

Z � � (insoluble in water)


10

35. 2000/II/34

Which of the following statements concerning helium is/are correct?

(1) The outermost electron shell of a helium atom has an octet structure

(2) Helium is used to fill weather balloons

(3) Helium exists as monatomic molecules


36. 2000/II/46

1st statement 2

nd statement

Carbon dioxide and silicon dioxide have similar The atoms of carbon and silicon have the same

physical properties. number of electrons in their outermost shells.

37. 2001/II/2

The hazard warning label shown below is found on a compressed gas cylinder.

Which of the following gases may be contained in the cylinder?

A. hydrogen B. oxygen C. chlorine D. argon

38. 2001/II/5

Which of the following substances can conduct electricity in both solid and liquid states?

A. sulphur B. mercury C. quartz D. lead(II) bromide

39. 2001/II/8

Which of the following statements concerning the formation of chloride ions from chlorine atoms is correct?

A. The number of shells occupied by electrons in a chlorine atom equals that in a chloride ion

B. The atomic number of chlorine increases by 1

C. The mass number of chlorine increases by 1

D. The change is an oxidation

40. 2001/II/20

The table below lists some information about two elements, X and Y:

Element Atomic number Relative atomic mass

X 12 24.0

Y 9 19.0

The compound formed from X and Y has a formula mass of

A. 43.0. B. 62.0. C. 67.0. D. 81.0.


11

41. 2001/II/42

Which of the following ions have the same number of electrons as a neon atom?

(1) Mg +2 (2) O −2 (3) Cl −


42. 2002/II/1

The electronic diagram of an atom of element X is shown below:

X

(Only electrons in the outermost shell are shown.)

The atomic number of X is probably

A. 7. B. 15. C. 17. D. 19.

43. 2003/II/12

Gallium (Ga) occurs naturally in two isotopic forms, 69

Ga and 71

Ga. The table below lists the relative

abundance of each isotope.

Isotope Relative abundance 69

Ga 60.2% 71

Ga 39.8%

What is the relative atomic mass of gallium?

A. 69.6 B. 69.8 C. 70.0 D. 70.2

44. 2003/II/18

Consider the following information about three elements, X, Y and Z.

Element Atomic number

X 12

Y 16

Z 17

Which of the following statements concerning X, Y and Z is correct?

A. X reacts with Z to form an ionic compound B. Y is a stronger oxidizing agent than Z

C. X has a simple molecular structure D. Y can conduct electricity in the molten state

45. 2003/II/46

1st statement 2

nd statement

35Cl and

37Cl have the same chemical properties. The number of electrons in the outermost

shell of a 35

Cl atom is equal to that of a 37

Cl atom.


12

46. 2004/II/1

How many elements does ammonium dichromate consist of?

A. 2 B. 3 C. 4 D. 5

47. 2004/II/23

Element X has three isotopes,206

X, 207

X and 208

X. The graph below shows the relative abundances of the isotopes.

What is the relative atomic mass of X?

A. 206.8 B. 207.0 C. 207.3 D. 207.5

48. 2004/II/31

The atomic number of element X is 15. It has only one isotope with a mass number of 31. Which of the

following statements concerning X is correct?

A. X forms an oxide which dissolves in water to give an alkaline solution

B. In the compound formed from X and sodium, X has an oxidation number of -3

C. X is a gas at room temperature and pressure

D. There are 15 neutrons in the nucleus of an atom of X

49. 2005/II/13


Particle

X Y Z W

No. of protons 8 8 8 10

No. of electrons 10 10 8 10

No. of neutrons 8 10 10 10

Which of the following statements about the particles is correct?

A. W and Z are isotopes B. X and Z have the same mass

C. Y and Z have the same charge D. X and W have the same electronic arrangement


13

50. 2006/II/5 56

26 Fe is an isotope of iron. Which of the following correctly describes the number of subatomic particles in

an Fe3+

ion formed from this isotope?

No. of electrons No. of neutrons

A. 23 26

B. 23 30

C. 24 26

D. 26 30

51. 2006/II/14

Element X has two isotopes, 39

X and 41

X. The table below lists the percentage abundance of the two isotopes:

Isotope Percentage abundance 39

X 93.2 41

X 6.8

What is the relative atomic mass of X?

A. 39.0 B. 39.1 C. 40.0 D. 40.9

52. 2007/II/13

M is an element in the Periodic Table. M −2 ion possesses 45 neutrons and 36 electrons. What is M?

A. Se B. Kr C. Sr D. Rh

53. 2007/II/28

1st statement 2

nd statement

Molten sulphur is a good conductor of electricity. Sulphur molecules are mobile in molten sulphur.

54. 2007/II/29

1st statement 2

nd statement

Isotopes of an element have the same mass. Isotopes of an element have the same number of protons.

55. 2007/II/30

1st statement 2

nd statement

Carbon can form a larger number of compounds Carbon atoms can share electrons with one another.

with long carbon chains.


14

1. 1990/II/5

In going down the group VI elements of the Periodic Table, there is an increase in

(1) the size of the atoms

(2) the melting point of the elements

(3) the oxidation power of the elements



2. 1992/II/1

Rubidium (Rb) is a group I element below potassium in the Periodic Table. Which of the following statements

about rubidium is correct?

A. Rubidium forms an acidic oxide

B. Rubidium is more reactive than potassium

C. Rubidium can be obtained from its oxide by reduction with carbon

D. The formula for rubidium chloride is RbCl2

3. 1993/II/2

The element, sodium to chlorine, in the third period of the Periodic Table shows a gradual change in properties.

Which of the following changes is correct?

A. Their melting points increase. B. Their ability to gain electrons increases.

C. Their oxides change from acidic to basic. D. Their chlorides change from covalent to ionic.

4. 1993/II/24

There is a gradual change in the properties of halogens from chlorine to iodine. Which of the following

properties “chlorine < bromine < iodine” are in the order?

(1) oxidizing power (2) density (3) boiling point


5. 1995/II/32

Astatine is a Group VII element below iodine in the Periodic Table. Which of the following statements

concerning astatine is/are correct?

(1) It is a liquid at room temperature and pressure.

(2) It reacts with sodium to from an ionic compound.

(3) It is a stronger oxidizing agent than iodine.


HKCEE CHEMISTRY | 2.2 Periodic Table | P.1

15

6. 1997/II/4

Which of the following statements concerning the elements in the third period of the Periodic Table is correct?

A. Both sulphur and chlorine can be reduced by aqueous sodium sulphite.

B. Magnesium is a stronger reducing agent than sodium.

C. Phosphorus and chlorine form a covalent compound.

D. Magnesium burns in oxygen to form an acidic oxide.

7. 1997/II/30

M is an element in the third period of the Periodic Table. M forms a sulphate which has the formula M2(SO4)3.

The formula of the nitrate of M is

A. MNO3. B. M(NO3)2. C. M(NO3)3. D. M2(NO3)3.

8. 1998/II/6

A part of the Periodic Table is shown below.


A. The outermost electron shell of an atom of a is an octet structure.

B. The metallic character of the Period 2 elements increases from b to d .

C. c forms an ionic compound with d.

D. e is a strong oxidizing agent.

9. 2000/II/2

Caesium (Cs) is a Group I element in the Periodic Table and its relative atomic mass is greater than that of

potassium. Which of the following statements concerning caesium is INCORRECT?

A. Caesium is a weaker reducing agent than potassium.

B. Caesium reacts violently with water.

C. Caesium is a soft metal.

D. Caesium reacts with oxygen to form an oxide with formula Cs2O.

10. 2000/II/9

The atomic number of element X is 12. X reacts with element Y to form an ionic compound with formula

XY2.To which group of the Periodic Table does Y belong ?

A. Group I B. Group IV C. Group VI D. Group VII

I II III IV V VI VII 0

1 a

Period 2 b c d

3 e


16

11. 2000/II/39

X is an element in Group VI of the Periodic Table. X can form X2-

ions.

Which of the following statements are correct?

(1) The oxidation number of X decreases when X2-

ion is formed.

(2) Both X atom and X2-

ion have the same number of electron shells.

(3) Both X atom and X2-

ion have the same nuclear charge.


12. 2001/II/49

1st statement 2

nd statement

Lithium is the most reactive element in Among the Group I elements, lithium loses electrons most readily.

Group I of the Periodic Table.

13. 2002/II/39

Which of the following statements concerning Group VII elements and their ions are correct?

(1) Chlorine has the highest oxidizing power among chlorine, bromine and iodine

(2) Iodide ions have the highest reducing power among chloride, bromide and iodide ions

(3) Bromine is a volatile liquid at room temperature and pressure


14. 2003/II/1

Which of the following pairs of elements in Groups I and VII of the Periodic Table would react with each

other most vigorously?

Group I Group VII

A. lithium fluorine

B. lithium iodine

C. potassium fluorine

D. potassium iodine

15. 2004/II/2

X, Y and Z are three consecutive elements in the Periodic Table. X forms a stable anion X-, while Z forms

a stable cation Z+. Which of the following statements about X, Y and Z is correct?

A. X, Y and Z are elements in the same period of the Periodic Table

B. Both X and Z are electrical conductors under room temperature and pressure

C. Y reacts with Z readily

D. X- and Z

+ have the same electronic arrangement

16. 2005/II/36

Which of the following properties of Group I elements decreases down the group?

A. melting point B. reducing power C. reactivity with water D. tendency to form cations


17

17. 2006/II/2

Which of the following statements about the Periodic Table is correct?

A. The elements are arranged in order of increasing relative atomic mass

B. The reactivity of the elements in Group II decreases down the group

C. The boiling point of the elements in Group VII decreases down the group

D. All elements in Group 0 exists in gaseous state at room temperature and pressure

18. 2007/II/3

X is an element in the Periodic Table and X+

ion has an electronic arrangement of 2,8,8. Which of the

following statements concerning X is correct?

A. X is a halogen B. X is a transition element C. X is a group 0 element D. X is a period 4 element

19. 2008/II/2

J and Q are two alkaline earth metals in the Periodic Table. If the atomic number of J is x, then the atomic

number of Q could be

A. x – 2 B. x + 6 C. x – 10 D. x + 18

20. 2008/II/22

Comparing the elements in the second period of the Periodic Table, from lithium to fluorine, which of the

following statements is/are correct?

(1) They show a gradual change from having metallic property to having non- metallic property

(2) They shows a gradual increases in the number of electron shells in their atoms

(3) They show a gradual decrease in melting point



18

1. 1990/II/3

The atomic numbers of element X and element Y are 13 and 16 respectively. The formula of the compound

formed between X and Y is likely to be

A. XY2 B. X2Y C. X2Y3 D. X3Y2

2. 1990/II/25

Bromine has a low melting point because

A. it is a non-metal

B. it is a member of the halogen family

C. the atoms in each bromine molecule are bonded together by a covalent bond

D. the bromine molecules are attracted together by van der Waals' forces

3. 1992/II/3

Which of the following electron diagrams is correct?

4. 1993/II/46

1st statement 2

nd statement

Sodium carbonate is not decomposed by heat. Sodium carbonate is an ionic compound.

5. 1994/II/1

If the atomic number of an element X is 13, the formula of its oxide is

A. XO2 B. XO3 C. X2O3 D. X3O2

6. 1994/II/36

X, Y and Z are three different elements. The electronic diagram (showing electrons in the outermost shells only)

of the compound formed by X, Y and Z is shown below:

ZYX

X

X

X

+

-


(1) There is one electron in the outermost shell of an atom of X

(2) There are five electrons in the outermost shell of an atom of Y

(3) There are eight electrons in the outermost shell of an atom of Z


HKCEE CHEMISTRY | 2.3 Ionic & covalent bonding | P.1

19

7. 1994/II/46

1st statement 2

nd statement

Hydrogen chloride has a lower melting point In each molecule of hydrogen chloride, a hydrogen atom

than sodium chloride. and a chlorine atom are joined together by a covalent bond.

8. 1995/II/2

The electronic structure of a compound formed between an element X and chloride is shown below.

Cl X Cl

Cl

(only electrons in the outermost shells are shown.)

What would be the formula of the compound formed between X and magnesium?

A. MgX B. MgX2 C. Mg2X3 D. Mg3X2

9. 1995/II/3

Which of the following correctly describes the structure of quartz?

A. giant covalent structure B. giant ionic structure

C. giant metallic structure D. simple molecular structure

10. 1996/II/45

1st statement 2

nd statement

The melting point of hydrogen chloride is Hydrogen chloride is a covalent compound

lower than that of potassium chloride. whereas potassium chloride is an ionic compound.

11. 1996/II/44

Which of the following elements can react together to form a covalent compound?

(1) argon (2) nitrogen (3) oxygen (4) calcium

A. (1) and (2) only B. (1) and (4) only C. (2) and (3) only D. (3) and (4) only

12. 1997/II/3

Argon exists as a gas at room temperature and pressure because

A. argon molecules are monoatomic

B. argon is chemically insert

C. the outermost electron shell of an argon atom has an octet structure

D. the attractive force between argon atoms is weak


20

13. 1997/II/5

Which of the following diagrams best represents a part of the giant lattice of sodium chloride crystal?

(In these diagrams, ● represents Na+ ion and ○ represents Cl

- ion)

A. B. C. D.

14. 1998/II/45

1st statement 2

nd statement

Element X (atomic number 11) reacts with element Each atom of X loses one electron and each atom

Y (atomic number 16) to form an ionic compound. of Y accepts two electrons to form a compound with

formula X2Y.

15. 1999/II/19

Ionic compound X has the formula AB2, where A and B represent the cation and anion respectively. If both

A and B have the same electronic arrangement, X may be

A. potassium sulphide. B. magnesium fluoride. C. silicon dioxide. D. calcium bromide.

16. 1999/II/34

Iodine is a solid at room temperature and pressure. Which of the following statements concerning the

structure of iodine is/are correct?

(1) Iodine has a giant covalent structure

(2) Iodine molecules are held together by van der Waals’ forces

(3) Iodine atoms are held together in pairs by covalent bonds


17. 2000/II/12

Which of the following natural substances is essentially a single compound?

A. air B. coal C. petroleum D. quartz

18. 2000/II/17

The melting point and boiling point of substance X are 321°C and 765°C respectively. In its molten state, X

conducts electricity without decomposition. X probably has

A. an ionic structure B. a metallic structure

C. a simple molecular structure D. a covalent network structure


21

19. 2001/II/37

Consider the information listed below:

Substance Attraction between particles in substance

(1) helium van der Waals’ forces

(2) diamond covalent bond

(3) magnesium oxide ionic bond

Which of the following combinations are correct?


20. 2002/II/29

In which of the following substances are the molecules furthest apart from each other at room temperature and

pressure?

A. butane B. water C. propan-1-ol D. iodine

21. 2002/II/36

Which of the following statements concerning fluorine is/are correct?

(1) It exists as monatomic molecules.

(2) It reacts with hydrogen to form a covalent compound.

(3) It reacts with calcium to form a compound with the formula CaF2.


22. 2002/II/45

1st statement 2

nd statement

Nitrogen monoxide is a gas at room compound. Nitrogen monoxide is a covalent temperature and pressure.

23. 2002/II/46

1st statement 2

nd statement

Combustion of diamond gives carbon dioxide. Diamond is a crystalline form of carbon.

24. 2003/II/25

An atom of element X has 20 protons while an atom of element Y has 7 electrons. What is the formula of the

compound formed from X and Y?

A. XY2 B. X2Y3 C. X2Y5 D. X3Y2


22

25. 2005/II/6


Element Atomic Number

W 6

X 17

Y 18

Z 20

Which of the following pairs of elements would react with each other most readily?

A. w and y B. w and z C. x and y D. x and z

26. 2005/II/7

Which of the following statements concerning van der Waals' forces is correct?

A. They exist in quartz B. They exist in limestone

C. They exist in solid iodine D. They exist in solid ammonium nitrate

27. 2005/II/9

Which of the following chlorides has the highest melting point?

A. HCl B. LiCl C. SCl2 D. CCl4

28. 2005/II/27

Which of the following properties of sodium chloride is/are evidence(s) to support that ionic bonds are strong?

(1) It is soluble in water

(2) It has a high melting point

(3) It can conduct electricity in molten state


29. 2006/II/1

The electronic diagram of a compound formed between element X and element Y is shown below:

Y X Y

(Only outermost shell electrons are shown.)

Which of the following combinations concerning X and Y is correct?

X Y

A. carbon oxygen

B. silicon oxygen

C. oxygen sodium

D. oxygen chlorine


23

30. 2006/II/24

In which of the following atoms or ions is the outermost shell an octet?

(1) Li + (2) Ne (3) S −2


31. 2007/II/12

Which of the following pairs of elements would form a covalent compound?

A. mercury and neon B. neon and nitrogen C. mercury and fluorine D. fluorine and nitrogen

32. 2007/II/18

Consider the information below:

Solid Melting point Electrical conductivity Solubility in water

W high good Insoluble

X high non-conducting Soluble

Y low non-conducting Soluble

Z very high non-conducting Insoluble

Which of the following solids is likely to be an ionic compounds?

A. W B. X C. Y D. Z

33. 2007/II/43

Which of the following bonds or attractive forces exist in ammonium nitrate?

(1) ionic bond (2) covalent (3) van der Waals' forces


34. 2008/II/9

The table below shows the colour of the aqueous solutions of three ionic compounds.

Compound Colour of aqueous solution

QT green

XZ yellow

XT colourless

Which of the following combinations about the colour of the ions involved is most likely to be correct?

O2-

(aq) X2+

(aq) T2-

(aq) Z2-

(aq)

A. colourless colourless colourless colourless

B. green yellow green yellow

C. colourless yellow green colourless

D. green colourless colourless yellow


24

35. 2008/II/18

In which of the following groups of substances there exists a difference in bonding type among the substances?

A. iodine, oxygen, nitrogen

B. chromium, mercury, aluminium

C. methane, ethyl ethanoate, sulphur dioxide

D. potassium chloride, hydrogen chloride, silver chloride

36. 2008/II/19

Which of the following statements concerning a water molecule is/are correct?

(1) The number of bonding electrons contributed by each hydrogen atom in the molecule is 2

(2) The number of bonding electrons contributed by the oxygen atom in the molecule is 2

(3) The total number of electrons in the molecule is 8


37. 2008/II/46

A certain form of solid carbon is compound of C60 molecules. Each C60 molecule is formed by 60

carbon atoms bonded together like a football as shown in the diagram below:

Which of the following statement is/are correct?

(1) The molar mass of C60 is 12.0g

(2) The solid gives carbon dioxide upon complete combustion

(3) The melting point of the solid is higher than that of diamond



25

1. 1992/II/2

X and Y are elements. The melting point of their chlorides are given below:

Melting point (°C )

Chloride of X 772

Chloride of Y -68


A. Both X and Y are metals

B. The chloride of Y is a solid at room temperature

C. The chloride of X conducts electricity in the solid state

D. The chloride of Y is a covalent compound

2. 1992/II/33

Which of the following ions is/are coloured?

(1) Pb2+

(2) Cr3+

(3) MnO4-


3. 1994/II/6

A drop of silver nitrate solution and a drop of sodium iodide solution are placed respectively at X and Y as

shown in the diagram below:

After the circuit has been closed for some time, a coloured patch is formed between X and Y.

What is the colour of the patch?

A. brown B. purple C. yellow D. black

4. 1994/II/7

The main aim of the above experiment is to show that

A. ions exist in silver nitrate solution and sodium iodide solution

B. sodium ions can react with nitrate ions

C. silver ions can react with iodide ions

D. potassium nitrate is an electrolyte

HKCEE CHEMISTRY | 2.4 Structures and properties | P.1

26

5. 1996/II/1

Magnesium and calcium have similar chemical properties because

A. their atoms have the same atomic structure

B. their atoms have the same number of electron shells

C. their atoms have the same number of electron in their outermost shells

D. their atoms have the same electronic arrangement

6. 1999/II/33

Which of the following reactions will occur when aluminium powder is added to silver nitrate solution?

(1) displacement

(2) anodization

(3) redox


7. 2001/II/18

Consider the following information about four substances, W, X, Y and Z :

Substance Melting Point/°C Electrical conductivity at room

W –23 poor

X 56 poor

Y 232 good

Z 750 poor

Which substance has a simple molecular structure and is a solid at room temperature?

A. W B. X C. Y D. Z

8. 2001/II/28

The set-up shown above is best used to collect

A. ammonia B. chlorine C. nitrogen D. sulphur dioxide

9. 2004/II/20

Which of the following statements concerning aqueous ammonia is correct?

A. It contains both ammonia molecules and ammonium ions

B. It is commonly used as the active ingredient in toilet cleaners

C. It reacts with iron(III) sulphate solution to give a green precipitate

D. It gives a colourless solution with phenolphthalein


27

10. 2004/II/29

Questions 10 and 11 refer to the melting points and boiling points of four substances at 1 atm pressure as

listed in the table below:

Substance Melting Point (°C) Boiling Point (°C)

Argon -189 -186

Bromine -7 59

Chlorine -101 -35

Sulphur dioxide -75 -10

Which substance exists as a liquid at -90°C and 1 atm pressure?

A. argon B. bromine C. chlorine D. sulphur dioxide

11. 2004/II/30

Which of the following chemical bonds/attractive forces exist(s) in all four substances at 25°C and

1 atm pressure?

(1) van der Waals' forces (2) ionic bond (3) covalent bond

A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3)

12. 2006/II/6

Which of the following substances exist(s) in liquid state at room temperature and pressure?

Substance Melting point/°C Boiling Point/°C

W -92 7

X 7 81

Y 56 197

Z -95 69

A. W B. X C. X and Z D. Y and Z

13. 2007/II/2

Which of the following substances has a sharp boiling point?

A. petrol B. red wine C. molten wax D. liquid ammonia

14. 2007/II/5

Metal Y and calcium are both in the same group of the Periodic Table. When equal mass of Y and calcium

respectively reacts with excess hydrochloric acid under the same condition, Y given more hydrogen than

calcium does. Which of the following deductions is correct?

A. The reactivity of Y is higher than that of calcium

B. The metallic bond in Y is weaker than that in calcium

C. The atomic number of Y is greater than that of calcium

D. The relative atomic mass of Y is smaller than that of calcium


28

15. 2007/II/22

Which of the following statements concerning chlorine, bromine an iodine is/are correct?

(1) They are all coloured substances

(2) Their reactivity increases with relative atomic mass

(3) They all react with sodium sulphite solution


16. 2007/II/31

Questions 16 and 17 refer to the element astatine (At), which has an atomic number of 85.

Which of the following diagrams best represent the arrangement of particles in a sample of astatine at room

temperature and pressure?

17. 2007/II/32

Which of the following statements concerning astatine is correct?

A. Astatine is soluble in heptane.

B. Astatine is a stronger oxidizing agent than chlorine.

C. Astatine is an element in period 5 of the Periodic Table.

D. The formula of the compound formed between astatine and potassium is K2At.

18. 2008/II/29

1st statement 2

nd statement

The boiling point of butane is higher than that The van der Waals' forces between butane molecules are

of methane. stronger than the forces between methane molecules.


29

1. 1992/II/34

Which of the following metals can be obtained by reducing their oxides with carbon?

(1) iron (2) calcium (3) lead


2. 1995/II/5

Which of the following methods can be used extract lead from lead (II) oxide?

A. heating lead (II) oxide in the absence of air

B. heating lead (II) oxide in the presence of air

C. heating lead (II) oxide with copper at high temperature.

D. heating lead (II) oxide with carbon at high temperature.

3. 1997/II/32

Which of the following metal oxides can be reduced to the metal when heated with carbon?

(1) aluminium oxide (2) lead (II) oxide (3) iron (III) oxide


4. 1997/II/41

Aluminium is used to make window frames because

(1) it is strong (2) it can resist corrosion (3) it is the most abundant metallic element in the earth crust


5. 1999/II/31

Which of the following metal oxides CANNOT be reduced by heating with carbon?

(1) magnesium oxide (2) lead (II) oxide (3) iron (III) oxide


6. 2000/II/3

Iron cans used for canning food are usually coated with tin instead of zinc. This is because

A. tin is more reactive than zinc

B. tin ions are non-toxic but zinc ions are toxic

C. tin forms an alloy with iron and this alloy is corrosion resistant

D. tin prevents iron cans from rusting by sacrificial protection

7. 2000/II/19

Gold ornaments are usually made from an alloy of gold and copper instead of pure gold.

This is because the alloy

A. can be found free in nature B. is more corrosion resistant than pure gold

C. is denser than pure gold D. is stronger than pure gold

HKCEE CHEMISTRY | 3.1 Extraction and the uses of metals | P.1

30

8. 2000/II/42

Which of the following statements concerning carbon, silicon and phosphorus are correct?

(1) Carbon forms numerous compounds with hydrogen and oxygen

(2) Silicon is used to make computer chips

(3) Phosphorus is an essential element for plant growth


9. 2000/II/50

1st statement 2

nd statement

Aluminium was used earlier than iron in Aluminium is more abundant than iron in the earth crust.

the history of mankind.

10. 2001/II/4

Which of the following combinations is INCORRECT?

Metal Use

A. chromium making stainless steel

B. lead making solder

C. nickel making rechargeable cells

D. titanium making coins

11. 2001/II/46

1st statement 2

nd statement

Electrical wire is made of bronze but not of copper. Bronze is more corrosion-resistant than copper.

12. 2002/II/27

Which of the following objects is least likely to contain titanium?

A. missile B. water tap C. bicycle frame D. artificial hip joint

13. 2003/II/5

Which of the following methods can be used to obtain aluminium from aluminium oxide?

A. reducing the oxide with carbon

B. heating the oxide strongly

C. electrolysis of the molten oxide

D. heating the oxide with iron powder


31

14. 2004/II/13

Which of the following combinations concerning the uses of metals is correct?

Metal Use

A. cadmium making rechargeable cells

B. copper making fuses in electric plugs

C. chromium making duralumin

D. zinc making cans for canned food

15. 2004/II/16

Magnesium can be obtained from magnesium oxide by

A. electrolysis of the molten oxide

B. heating the oxide strongly

C. heating the oxide with carbon

D. heating the oxide with zinc powder

16. 2006/II/9

Which of the following properties is considered the most important one when choosing an alloy for making

fuse in electric plugs?

A. low melting point

B. high electrical conductivity

C. good ductility

D. high mechanical strength


32

1. 1990/II/20

Which of the following gases would support the combustion of a piece of burning magnesium ribbon?

(1) carbon dioxide (2) sulphur dioxide (3) chlorine


2. 1990/II/21

Which of the following pairs of substances would react to produce hydrogen?

(1) iron and steam (2) sodium and ethanol (3) magnesium and concentrated sulphur acid


3. 1990/II/45

1st statement 2

nd statement

Magnesium chloride solution gives a white precipitate Magnesium is higher than lead in the metal activity

with lead(II) nitrate solution. series.

4. 1991/II/8

X,Y and Z are metals. Y can displace X from a solution of the nitrate of X. Oxides of X and Y can be reduced

by hydrogen but not the oxide of Z. Which of the following arrangements represents the correct descending

order of reactivity of the metals?

A. Z > Y > X B. X > Y > Z C. Z > X > Y D. X > Z > Y

5. 1991/II/31

Which of the following substances, when heated, can react with oxygen?

(1) sodium (2) sulphur (3) iron

A. (2) only B. (1) and (2) only C. (1) and (3) only D. (1),(2) and (3)

6. 1992/II/31

In the above experiment, a gas is evolved and burns at the jet. Metal X is probably

A. zinc B. aluminium C. magnesium D. copper

7. 1993/II/11

The following substances were burnt in oxygen and the products were mixed with water. Which of these

substances would produce a resulting solution with the highest pH value?

A. calcium B. iron C. sulphur D. carbon

HKCEE CHEMISTRY | 3.2 Reactivity of metals | P.1

33

8. 1993/II/14

The carbonates of three metals W, X and Y are separately heated strongly and the results obtained are tabulated

below:

Metal Action of heat on metal carbonate

W CO2 (g) and O2 (g) evolved

X No reaction

Y CO2 (g) evolved

Which of the following arrangements represents the correct decreasing order of reactivity of the metals?

A. W > X > Y B. W > Y > X C. X > Y > W D. Y > W > X

9. 1993/II/26

On heating, blue copper(II) sulphate crystals gradually change to a white powder. Which of the following

statements are correct?

(1) Heat would be liberated if water is added to the white powder

(2) On further heating, the white powder would turn reddish-brown.

(3) A chemical change occurs during the heating of the blue crystals


10. 1995/II/17

Compound X is a white solid. When X is warmed with sodium hydroxide solution, a gas is evolved which

turns moist red litmus paper blue. When chloride water is added to an aqueous solution of X, a brown solution

is formed. X is probably

A. ammonium bromide B. ammonium chloride C. sodium bromide D. sodium chloride

11. 1995/II/18

Metal X reacts with dilute hydrochloric acid to liberate hydrogen. But metal Y and metal Z have no reaction

with the dilute acid. The oxide of metal Y decomposes on heating but the oxide of metal Z does not. Which of

the following arrangements represents the order of increasing reactivity of the three metals?

A. X < Y < Z B. Y < Z < X C. X < Z < Y D. Z < Y < X

12. 1996/II/12

Consider the following experiment :

After the experiment , the residue in the combustion tube is dissolved in water and an alkaline solution

is obtained. X may be

A. carbon B. magnesium C. silver D. sulphur


34

13. 1997/II/10


Chemical Method of storage

A. Calcium Under water

B. Potassium Under paraffin oil

C. Ethanol In a cool place

D. Potassium permanganate solution In a brown bottle

14. 1997/II/47

1st statement 2

nd statement

The reaction of sodium with water produces hydrogen. The reaction of sodium with water is exothermic.

15. 1998/II/11

Consider the following experiment.

During the experiment, a gas is liberated. The gas burn at the end of the delivery tube. X is probably

A. copper B. lead C. silver D. zinc

16. 1998/II/12

A gas X is bubbled into a solution of Y as shown in the above diagram. In which of the following combinations

would X react with Y?

X Y

A. Ammonia Potassium nitrate

B. Chlorine Potassium nitrate

C. Carbon dioxide Sodium hydroxide

D. Sulphur dioxide Iron (II) sulphate


35

17. 1998/II/19

In each of the four solutions shown below, a strip of zinc is added.


Tube Observation

A. I No change

B. II Brown coating on zinc

C. III No change

D. IV Grey coating on zinc

18. 1999/II/45

1st statement 2

nd statement

Sulphur is classified as a non-metal. Sulphur does not react with dilute acids.

19. 2000/II/33

In an experiment, a piece of calcium metal was added to a beaker of water. Which of the following statements

concerning the experiment is/are correct?

(1) The calcium metal sank to the bottom of the beaker

(2) The calcium metal burnt with a brick red flame

(3) At the end of the experiment, an alkaline solution was formed in the beaker


20. 2001/II/7

Which of the following statements concerning water is correct?

A. It reacts with calcium to give a colourless gas. B. It is a strong electrolyte.

C. It turns anhydrous cobalt(II) chloride from pink to blue. D. It is immiscible with methanol.

21. 2001/II/38

In which of the following experiments would a metal be produced?

(1) heating silver oxide

(2) heating iron pyrite

(3) heating a mixture of lead(II) oxide and carbon powder



36

22. 2002/II/26

When a piece of copper is dropped into an aqueous solution of compound X, the copper gradually dissolves.

X is probably

A. magnesium chloride B. lead(II) nitrate C. silver nitrate D. ammonium chloride

23. 2004/II/48

1st statement 2

nd statement

Lead can displace iron from iron(II) nitrate solution. Lead occupies a higher position in the electrochemical

series than iron.

24. 2006/II/13

X and Y are two different metals. Which of the following shows that Y is more reactive than X?

A. X forms an ion with a charge of +2 while Y forms an ion with a charge of +1

B. X reacts with dilute hydrochloric acid but Y does not

C. X can displace Y from an aqueous solution of a salt of Y

D. The oxide of Y undergoes decomposition upon strong heating but the oxide of Y does not

25. 2006/II/21

When substances X is treated with an aqueous solution of iron(II) sulphate, the iron(II) ions act as

oxidizing agent. X may be

A. concentrated hydrochloric acid B. aqueous ammonia

C. acidified potassium dichromate solution D. zinc granules

26. 2006/II/29

1st statement 2

nd statement

Potassium is stronger reducing agent than sodium. Potassium atoms lose electrons more readily than sodium

atoms.

27. 2007/II/7

X,Y and Z are metals. The table below shows the observations when each of them is put into copper(II) sulphate

solution:

Metal Observation

X No observable change

Y Brown solid formed and colourless gas evolved

Z Brown solid formed

Which of the following arrangements correctly represent the ascending order of reactivity of the metals?

A. X < Z < Y B. Y < Z < X C. Z < X < Y D. X < Y < Z


37

28. 2007/II/10

Which of the following suggestions for storing chemicals is acceptable?

A. storing sodium in a brown glass bottle

B. storing silver nitrate solution in an iron can

C. storing ethyl ethanoate in an expanded polystyrene container

D. storing concentrated sulphuric acid in a polyvinyl chloride bottle

29. 2008/II/20

A small piece of potassium is dropped into a trough of water containing methyl orange. Which of the following

observations is/are correct?

(1) The potassium moves about on the water surface with a hissing sound

(2) The potassium dissolves in water and the solution turns red

(3) The potassium burns with a golden yellow flame


30. 2008/II/50

1st statement 2

nd statement

When equal mass of Mg and Zn granules is Mg is more reactive than Zn.

added separately to excess dilute H2SO4,

a greater amount of gas will be produced

by Mg than Zn.


38

1. 1990/II/9

The molecular formula of a gas is X3. If the Avogadro’s number is L mol-1

, how many molecules are there

in 96g of X3? (Relative atomic mass of X = 16.6)

A. 2

1L B. 2L C. 3L D. 6L

2. 1990/II/10

If 2 g of carbon dioxide gas contain x molecules, how many molecules are present in 2 g of helium gas?

(Relative atomic masses: He = 4.0, C = 12.0, O = 16.0)

A. x B. 52

1x C. 7x D. 11x

3. 1990/II/31

16.1 g of a hydrated metal sulphate was heated to constant mass. After cooling to room temperature, the residual

anhydrous metal sulphate weighted 7.1 g. How many moles of water of crystallization are there in one mole of

the hydrated metal sulphate? (Relative atomic mass : anhydrous metal sulphate = 142.0 ; water = 18.0)

A. 4 B. 5 C. 7 D. 10

4. 1991/II/11

2.60 g of a metal X combine with 1.20 g of oxygen to form an oxide in which the oxidation number

of X is +3. What is the relative atomic mass of X? (Relative atomic mass : O = 16.0)

A. 11.6 B. 34.7 C. 52.0 D. 104

5. 1991/II/18

22 g of calcium carbonate are allowed to reacted with 200cm3

of 0.5 M hydrochloric acid until no further

reaction occurs. What is the mass of calcium carbonate left behind?

(Relative atomic masses : C = 12.0 ; O = 16.0 ; Ca = 40.0)

A. 2g B. 5g C. 12g D. 17g

6. 1991/II/23

1.55 g of a hydrated sodium carbonate, Na2CO3‧x H2O, react completely with 25 cm3

of 1M hydrochloric acid.

What is the value of x? (Relative atomic masses : H = 1.0 ; C = 12.0 ; O = 16.0 ; Na = 23.0)

A. 1 B. 2 C. 4 D. 10

7. 1992/II/6

0.01 mol of C2H5OH is burnt completely in oxygen. What are the numbers of moles of carbon dioxide

and water formed respectively?

carbon dioxide water carbon dioxide water

A. 0.01 0.03 B. 0.02 0.03

C. 0.02 0.06 D. 0.04 0.06

HKCEE CHEMISTRY | 3.3 Reactivity masses | P.1

39

8. 1992/II/7

Which of the following gases, each having a mass of 10.0 g, has the greatest number of molecules at room

temperature and pressure? (Relative atomic masses: C = 12.0 ; N = 14.0 ; O = 16.0 ; F = 19.0; Ne = 20.2)

A. nitrogen B. fluorine C. neon D. carbon monoxide

9. 1993/II/8

The molecular formula of gaseous element X is X2. If the relative atomic mass of X is 19, what is the number of

molecules in 114g of the gas? (Avogadro’s number = 6.02 x 1023

)

A. 3 B. 6 C. 3 x 6.02 x 1023

D. 6 x 6.02 x 10

23

10. 1994/II/8

Which of the following contains the same number of atoms as 2.20 g of carbon dioxide?

(Relative atomic masses : H = 1.0 ; C = 12.0 ; N = 14.0 ; O = 16.0 ; S = 32.0 ; Cl = 35.5)

A. 1.70 g of ammonia B. 2.25 g of nitrogen monoxide

C. 2.80 g of sulphur dioxide D. 3.55 g of chlorine

11. 1994/II/18

The formula of hydrated magnesium sulphate crystals is MgSO4‧xH2O. When 3.80 g of the hydrated crystals

are heated, 2.00 g of anhydrous magnesium sulphate are produced. What is the value of x?

(Relative atomic masses: H = 1.0 , O = 16.0 , Mg = 24.0 , S = 32.0)

A. 3 B. 4 C. 5 D. 6

12. 1997/II/14

The formula of a metal carbonate is X2CO3. 100 cm3 of a solution containing 0.69 g of the carbonate requires

50 cm3 of 0.20 M hydrochloride acid for complete reaction. What is the relative atomic mass of metal X?

(Relative atomic masses : C=12.0 , O=16.0)

A. 19.0 B. 23.0 C. 39.0 D. 78.0

13. 1997/II/28

What mass of copper is obtained when 0.40 mol of copper (II) oxide are completely reduced by carbon?

(Relative atomic masses : O=16.0, Cu = 63.5)

A. 12.7 g B. 15.9 g C. 25.4 g D. 31.8 g


40

14. 1997/II/34

One mole of sulphur atoms has a mass twice that of one mole of oxygen atoms. Which of the following

statements is/are correct?

(1) 2 g of sulphur and 1 g of oxygen each occupy the same volume at room temperature and pressure

(2) 2 g of sulphur and 1 g of oxygen each contain the same number of atoms

(3) The number of atoms contained in one mole of sulphur is twice that contained in one mole of oxygen


15. 1998/II/2

The formula for ozone is O3. If one mole of ozone contains x atoms, how many atoms will atoms will

one mole of oxygen gas contain?

A. x/3 B. 2x/3 C. 3x/2 D. 3x

16. 1998/II/10

The formula for hydrated iron (II) sulphate is FeSO4‧xH2O. On strong heating, 20.1 g of the sulphate produces

9.1 g of water. What is the value of x? (Relative atomic masses: H = 1.0 , O = 16.0 , S = 32.1 , Fe = 56.0)

A. 5 B. 6 C. 7 D. 8

17. 1998/II/20

The following equation represents the reaction of an oxide of lead with hydrogen:

Pb3O4 (s) + 4H2(g) → 3Pb(s) + 4H2O(l)

What mass of lead would be obtained if 68.5 g of the oxide was consumed in the reaction?

(Relative atomic masses: O = 16.0 , Pb = 207.0)

A. 20.7 g B. 41.4 g C. 62.1 g D. 82.8 g

18. 1999/II/2

One mole of calcium bromide contains

A. 1 mole of molecules B. 2 mole of cations C. 2 mole of anions D. 3 mole of atoms

19. 1999/II/8

Iron can be produced from iron (III) oxide by the following reaction:

Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)

What mass of iron (III) oxide is required to produce 2.1 g of iron?

(Relative atomic masses : O = 16.0 , Fe = 56.0)

A. 3.0 g. B. 4.5 g. C. 6.0 g. D. 9.0 g


41

20. 1999/II/17

The compound X2S contains 58.9 % of X by mass. What is the relative atomic mass of X?

(Relative atomic mass : S =32.1)

A. 11.5 B. 23.0 C. 39.0 D. 46.0

21. 2000/II/4

Metal X forms an oxide. 27.53 g of this oxide contains 24.96 g of X. What is the mole ratio of X to oxygen

in the oxide ? (Relative atomic masses : O = 16.0 , X = 207.0)

A. 1 : 1 B. 1 : 2 C. 2 : 3 D. 3 : 4

22. 2001/II/6

When potassium carbonate solution and calcium chloride solution are mixed, calcium carbonate is precipitated.

Which of the following mixtures would produce the greatest amount of precipitate?

A. 5 cm3

of 1 M K2CO3 (aq) + 15 cm3

of 1 M CaCl2 (aq)

B. 10 cm3

of 1 M K2CO3 (aq) + 10 cm3

of 1 M CaCl2 (aq)

C. 15 cm3

of 1 M K2CO3 (aq) + 8 cm3

of 1 M CaCl2 (aq)

D. 18 cm3

of 1 M K2CO3 (aq) + 5 cm3

of 1 M CaCl2 (aq)

23. 2001/II/19

Consider the half equations of a redox reaction :

8H+ (aq) + MnO4

-(aq) + 5e

- → Mn

2+(aq) + 4H2O(l)

C2O42-

(aq) → 2CO2(g) + 2e-

How many moles of MnO4− (aq) ions will react completely with one mole of C2O4

−2 (aq) ions ?

A. 0.4 B. 1.0 C. 2.5 D. 5.0

24. 2001/II/26

What is the percentage by mass of chromium in potassium dichromate?

(Relative atomic masses : O = 16.0, K = 39.1, Cr = 52.0)

A. 17.7 B. 25.1 C. 35.4 D. 40.8

25. 2002/II/3

An oxide of element X has the formula X2O3. 10.2 g of this oxide contains 5.4 g of X.

What is the relative atomic mass of X ? (Relative atomic mass : O = 16.0)

A. 12.0 B. 18.0 C. 27.0 D. 36.0


42

26. 2002/II/14

Ammonium dichromate, (NH4) 2Cr2O7 , decomposes on heating to give chromium(III) oxide, water and

nitrogen. What mass of water is obtained when 126 g of ammonium dichromate undergoes complete

decomposition?

(Relative atomic masses : H = 1.0, N = 14.0, O = 16.0, Cr = 52.0)

A. 9 g B. 18 g C. 36 g D. 72 g

27. 2002/II/23

Which of the following gases contains the greatest number of molecules at room temperature and pressure?

(Relative atomic masses : H = 1.0, N = 14.0, O = 16.0, Cl = 35.5)

A. 2.0 g of hydrogen B. 16.0 g of oxygen C. 18.0 g of ammonia D. 60.0 g of chlorine

28. 2003/II/11

A sample of MgSO4.xH2O(s) of mass 123.2 g contains 63.0 g of water of crystallization. What is the value of x?

(Relative atomic masses : H = 1.0 , O = 16.0 , Mg = 24.3 , S = 32.1)

A. 4 B. 5 C. 6 D. 7

29. 2003/II/28

Which of the following gases contains the greatest number of molecules?

(Relative atomic masses : H = 1.0 , C = 12.0 , O = 16.0 , Ne = 20.2 , Cl = 35.5)

A. 50.0 g of neon B. 50.0g of oxygen C. 50.0g of hydrogen chloride D. 50.0g of carbon monoxide

30. 2004/II/12

The relative atomic mass of element X is 74.9. It forms an oxide containing 24.3% of oxygen by mass.

What is the mole ratio of X to oxygen in the oxide? (Relative atomic mass: O = 16.0)

A. 1 : 2 B. 1 : 3 C. 2 : 3 D. 2 : 5

31. 2004/II/26

What is the percentage by mass of nitrogen in the fertilizer (NH4) 2HPO4?

(Relative atomic masses: H =1.0 , N = 14.0 , O =16.0 , P = 31.0)

A. 10.6% B. 12.3% C. 21.2% D. 24.6%

32. 2005/II/23

Which of the following samples of gases contains the smallest number of molecules?

(Relative atomic masses : H = 1.0, C = 12.0, N = 14.0, O = 16.0, S = 32.1)

A. 10 g of NO2 B. 10 g of CO2 C. 10 g of H2S D. 10 g of C2H4


43

33. 2005/II/37

Methane burns completely in oxygen according to the following equation:

CH4 + 2O2 → CO2 + 2H2O

What is the mass of oxygen required for the complete combustion of 48g of methane?

(Relative atomic masses: H = 1.0, C = 12.0, O = 16.0)

A. 48 g B. 96 g C. 192 g D. 384 g

34. 2005/II/44

Which of the following statements concerning 1 mole of aluminium is/are correct?

(Avogadro’s constant = 6.02 x 10 23 ; Molar volume of gas at room temperature and pressure = 24 dm 3 )

(1) It can form 1 mole of Al +3 ions

(2) It can form 3 x 6.02 x 10 23 Al +3 ions

(3) It occupies 24 dm 3 at room temperature and pressure


35. 2006/II/18

Element X forms two oxides XO and XO2. If 1 mole of XO contains n atoms, 2 moles of XO2 would contain

A. 3/2 n atoms B. 2n atoms C. 3n atoms D. 6n atoms

36. 2006/II/37

The relative atomic mass of metal X is 55.8. 23.90 g of X is allowed to react with excess oxygen until X is

completely oxidized. The mass of the metal oxide obtained is 34.18 g. What is the empirical formula of the

oxide? (Relative atomic mss : O = 16.0)

A. XO B. X2O3 C. X3O2 D. X3O4

37. 2007/II/11

D , J , R and Y represent four different compounds. D and J react according to the following equation:

D + 2J → R + 2Y

d grams of D react with j grams of J to give r grams of R and y grams of Y. What is the value of y?

A. d + j - r B. d + 2j - r C. 2( d + j – r) D. (d + 2j – r )/2

38. 2007/II/14

How many moles of ethane contain y hydrogen atoms? (L represents the Avogadro’s constant.)

A. y/L B. L/y C. y/6L D. 6y/L

39. 2007/II/34

What mass of iron can be obtained by complete reduction of 7.18g of iron(III) oxide?

(Relative atomic masses : Fe = 55.8, O = 16.0)

A. 2.51g B. 3.86g C. 5.02g D. 5.58g


44

40. 2008/II/10

Which of the following has the greatest number of ions?

A. 5 mole of iron(III) sulphate B. 6 moles of aluminium fluoride

C. 7 moles of lead(II) nitrate D. 8 moles of magnesium sulphide


45

1. 1990/II/15

The reddish-brown rust that forms on the surface of iron can be removed by using

A. paraffin oil B. dilute sulphuric acid

C. concentrated ammonia solution D. dilute sodium hydroxide solution

2. 1990/II/49

1st statement 2

nd statement

Sea water can corrode ships more quickly than fresh water. Sodium chloride in sea water speeds up the

corrosion of iron.

3. 1993/II/20

Q.3 and Q.4 refer to the following experiment: Three different pairs of metal wires are placed separately

in petri dishes (as shown in the diagram below) containing a mixture of gelatin, potassium hexacyanoferrate(III)

solution and phenolphthalein solution.


(1) The iron wire in Dish I does not corrode readily.

(2) The iron wire in Dish II corrodes readily.

(3) The iron wires in Dish III do not corrode.


4. 1993/II/21

In Dish II, which of the following colours will develop around the iron wire and the copper wire?

iron wire copper wire

A. pink blue

B. blue pink

C. pink no colour

D. blue no colour

5. 1995/II/45

1st statement 2

nd statement

When a piece of iron wire coupled with a piece Tin prevents iron from corrosion by sacrificial protection.

of tin wire is left in the air for a long period

of time, the iron wire does not corrode.

HKCEE CHEMISTRY | 3.4 Corrosion of metals | P.1

46

6. 1996/II/8

Zinc blocks are often attached to the steel legs of off-shore oil platforms because

A. zinc can protect steel from corrosion. B. zinc is more resistant to corrosion than steel.

C. zinc is harder than steel. D. zinc does not react with crude oil.

7. 1996/II/47

1st statement 2

nd statement

The resistance of aluminium to corrosion During anodization, aluminium oxide

can be enhanced by anodization. on the metal surface is reduced to aluminium.

8. 1997/II/48

1st statement 2

nd statement

The body of a motor car will corrode faster if common Common salt and water form a conducting solution

salts is sprinkled on roads after a heavy snow.

9. 1999/II/22

In which of the following situations is iron prevented from rusting by sacrificial protection?

A. Iron plates are jointed together with copper rivets. B. Iron pipes are connected to lead blocks.

C. Iron sheets are plated with zinc. D. Iron cans are coated with tin.

10. 2001/II/30

Which iron nail in the test tubes shown below would rust most slowly?

11. 2002/II/8

Which of the following statements concerning aluminium is correct ?

A. Aluminium is used to make stainless steel.

B. The strength of aluminium can be enhanced by anodization.

C. Aluminium is the most abundant element in the earth’s crust.

D. When aluminium is exposed to air, a layer of aluminium oxide is formed on its surface.

12. 2003/II/9

Which iron nail in the beaker shown below would undergo corrosion most readily?


47

13. 2005/II/10

Questions 13 ad 14 refer to the following experiment.

If the iron nail rusts, what would the colour of the rust indicator be around the nail?

A. yellow B. brown C. red D. blue

14. 2005/II/11

In which of the dishes would the iron nail rust?

A. dish 1 B. dish 2 C. dish 1 and dish 3 D. dish 2 and dish 4

15. 2005/II/48

1st statement 2

nd statement

Anodization is a method used to enhance corrosion By anodization, an oxide layer

resistance of aluminium is formed to protect the aluminium

16. 2006/II/34

Which of the following changes occurs after an aluminium article has been anodized?

A. Its electrical conductivity increases B. Its tensile strength increases

C. It becomes more easily dyed D. It becomes more easily oxidized

17. 2007/II/48

1st statement 2

nd statement

Galvanized iron is used for making food cans. Zinc can prevent iron from rusting by sacrificial protection.

18. 2008/II/12

Green patches appear on the surface of a metallic statue in a museum. It can be deduced that the statue may

contain

A. tin B. iron C. silver D. copper


48

1. 1990/II/13

A pupil, working with dilute acids in the laboratory, carelessly poured the unused acids into the sink. Later

it was found that the copper pipe in the sink had begun to leak. Which of the following acids is/are most

likely to have caused the damage?

(1) dilute nitric acid

(2) dilute sulphuric acid

(3) dilute hydrochloric acid


2. 1990/II/17

Zinc does NOT liberate hydrogen from a 0.5 M nitric acid solution because

A. zinc is an uncreative metal B. nitric acids an oxidizing agent

C. the concentration of hydrogen ions in the nitric acid is too low

D. a layer of oxide film is formed on the surface of zinc to prevent further reaction

3. 1990/II/22

Z is a white solid. When dilute hydrochloric acid is added to X, a colourless gas is liberated.

An aqueous solution of X gives a white precipitate with silver nitrate solution. X is probably

A. ammonium chloride B. sodium ethanote C. sodium carbonate D. calcium carbonate

4. 1990/II/44

If dilute hydrochloric acid gets into a student's eye during an experiment, the first thing the student should do is to

A. dial 999 for help B. wash the eye with water

C. wash the eye with dilute ammonia solution D. wash the eye with dilute sodium hydroxide solution

5. 1991/II/45

Which of the following statements about hydrogen chloride is/are correct?

(1) If forms dense white fumes with ammonia gas

(2) If dissolves in methylbenzene to form H+

and Cl- ions

(3) It turns dry litmus paper red


6. 1991/II/48

1st statement 2

nd statement

Hydrogen chloride can be prepared by the action Concentrated nitric acid is a non-volatile acid.

of concentrated nitric acid on solid sodium chloride.

HKCEE CHEMISTRY | 4.1 Acids | P.1

49

7. 1993/II/5

Q.7 and Q.8 refer to the following experiment:

A silver coin, with a mass of 12.00 g, was dissolved completely in concentrated nitric acid. When excess

potassium solution was added to the resulting solution, 14.35 g of a white precipitate were obtained.

Which of the following equations correctly represents the reaction between silver and concentrated nitric acid?

A. Ag + 2H+ → Ag+ + NO2 + H2O B. Ag + 4H+ + 2NO3

– → Ag + 4NO2 + O2 + 2H2O

C. 3Ag + 4HNO3 → AgNO3 + 3NO2 + 2H2O D. Ag + 4HNO3 → AgNO3 + 3NO2 + 2H2O

8. 1993/II/6

What is the percentage by mass of silver in the coin?

(Relative atomic masses : Cl = 35.5 , Ag = 108)

A. 45 B. 60 C. 75 D. 90

9. 1994/II/33

Which of the following statements concerning 25.0 cm 3 of 0.1 M hydrochloric acid and 25.0cm 3 of 0.1 M

ethanoic acid is/are correct?

(1) They contain the same number of hydrogen ions

(2) They require the same volume of 0.1 M sodium hydroxide solution for complete neutralization

(3) They react with excess granules at the same rate


10. 1995/II/35

Which of the following substances, when mixed with lemon juice, would give off gas bubbles?

(1) iron nails (2) milk of magnesia (3) polyethene wrap


11. 1995/II/40

Which of the following methods can produce hydrogen?

(1) adding zinc to water

(2) electrolyzing dilute sulphuric acid

(3) adding magnesium to dilute hydrochloride acid


12. 1995/II/46

1st statement 2

nd statement

The basicity of ethanoic acid is four. One molecule of ethanoic acid contains four atoms of hydrogen.


50

13. 1997/II/31

Which of the following statements concerning citric acid is/are correct?

(1) It is a strong acid

(2) It is present in oranges

(3) It exists as a solid at room temperature


14. 1997/II/50

1st statement 2

nd statement

Concentrated hydrochloric acid can react with silver. Concentrated hydrochloric acid is a strong oxidizing agent.

15. 1998/II/9

Which of the following substances has a pH less than 7?

A. lemon juice

B. soap solution

C. glass cleaner

D. milk of magnesia

16. 1999/II/18

Which of the following processes would NOT produce hydrogen gas?

A. adding calcium to water. B. adding magnesium to dilute nitric acid.

C. adding copper to dilute nitric acid. D. passing steam over red hot iron.

17. 1999/II/38

Which of he following reactions is/are commonly stored in blown bottles?

(1) potassium permanganate solution (2) concentrated sulphuric acid (3) concentrated nitric acid


18. 2001/II/23

Phosphoric acid is a tribasic acid with formula H3PO4. Which of the following formulae is INCORRECT?

A. CaH2PO4 B. Mg3(PO4)2 C. (NH4)2HPO4 D. Na2HPO4

19. 2002/II/5

Consider the aqueous solutions listed below:

(1) 1M ethanoic acid

(2) 1M hydrochloric acid

(3) 1M ammonia solution

Which of the following represents the increasing order of pH of the solutions?

A. (1), (2), (3) B. (2), (1), (3) C. (3), (1), (2) D. (3), (2), (1)


51

20. 2002/II/19

Which of the following acids, when heated with copper, would produce a gas?

A. dilute nitric acid B. dilute hydrochloric acid C. dilute sulphuric acid D. concentrated ethanoic acid

21. 2002/II/48

1st statement 2

nd statement

The basicity of methanoic acid is The number of hydrogen atoms in a molecule of methanoic

different from that of ethanoic acid. acid is different from that in a molecule of ethanoic acid.

22. 2003/II/4

Which of the following statements concerning nitric acid is INCORRECT?

A. It is manufactured from ammonia B. It is used to make explosives

C. It is used to make fertilizers D. It is a dehydrating agent

23. 2004/II/5

Which of the following statements concerning nitric acid is correct?

A. Nitric acid can be used as a fertilizer (Out of Syll.)

B. Nitrogen monoxide is a raw material in the manufacture of nitric acid (Out of Syll.)

C. In the laboratory, concentrated nitric acid is commonly stored in brown bottles

D. The following hazard warning label should be displaced on a bottle of concentrated nitric acid.

24. 2004/II/44

When solid critic acid is added to an aqueous solution of sodium hydrogencarbonate, the mixture fizzes.

Which of the following ions/compounds are responsible for the fizz?

(1) sodium ions

(2) hydrogencarbonate ions

(3) citric acid

(4) water

A. (1),(2) and (3) B. (1),(3) and (4) C. (2),(3) and (4) D. (1),(2),(3) and (4)

25. 2005/II/14

Which of the following compounds has the highest basicity?

A. HCl B. HCOOH C. H2SO4 D. CH3COOH


52

26. 2005/II/18

The following hazard warning labels are displayed on the regent bottle of the acid.

What information about this acid can be obtained from the labels?

A. It is very concentrated and flammable B. It is very concentrated and oxidizing

C. It is flammable and corrosive D. It is corrosive and oxidizing

27. 2005/II/29

1st statement 2

nd statement

Citric acid is an electrolyte. When citric acid is dissolved in water, citric acid molecules become mobile.

28. 2005/II/33

When a metal X is warmed with an acid Y, they react to form a colourless solution and a brown gas.


X Y

A. zinc concentrated nitric acid

B. copper concentrated sulphuric acid

C. zinc concentrated sulphuric acid

D. copper concentrated nitric acid

29. 2005/II/38

Which of the following pairs of substances would NOT react together?

A. copper, dilute ethanoic aid B. copper(II) oxide, dilute ethanoic acid

C. copper(II) hydroxide, dilute sulphuric acid D. copper(II) carbonate, dilute sulphuric acid

30. 2006/II/11

Which of the following statements about acids is correct?

A. Nitric acid is used in car batteries

B. Hydrochloric acid is produced in human stomach

C. Ethanoic acid is a strong oxidizing agent

D. The following hazard warning label should be displayed on a bottle of concentrated sulphuric acid


53

31. 2006/II/28

1st statement 2

nd statement

Solid citric acid reacts with magnesium to give hydrogen. Citric acid contains ionisable hydrogen atoms.

32. 2006/II/48

1st statement 2

nd statement

Carbon dioxide can effectively be prepared by Carbonates react with dilute acids to give carbon dioxide.

the action of dilute sulphuric acid on calcium

carbonate.

33. 2007/II/1

Which of the following pairs of aqueous solutions can be distinguished by using dilute hydrochloric acid?

A. zinc iodize and zinc bromide B. silver nitrate and magnesium sulphate

C. potassium hydroxide and sodium hydroxide D. sodium carbonate and calcium hydrogencarbonate

34. 2007/II/46

Which of the following statements concerning the reaction of concentrated nitric acid with copper

is / are correct?

(1) A colourless gas is evolved.

(2) One mole of NO3-(aq) ions requires one mole of electrons for reduction.

(3) It involves a displacement reaction.


35. 2008/II/3

Which of the following ions will NOT react with hot HCl(aq) or hot NaOH(aq)?

A. Fe −2 (aq) B. NH4+ (aq) C. SO4

−2 (aq) D. SO3−2 (aq)

36. 2008/II/17

The basicity of an acid is

A. a value to express the concentration of the acid

B. the number of hydrogen atoms in one acid molecules

C. the number of moles of any base which can completely react with one mole of the acid

D. the number of hydrogen ions which can produced by complete ionization of one acid molecule


54

37. 2008/II/30

1st statement 2

nd statement

If concentrated hydrochloric acid is Concentrated ammonia solution is a weak alkali.

dropped onto one's hand, one should

wash the hand immediately with concentrated

ammonia solution.

38. 2008/II/33

When calcium granules are added to water, colourless gas bubbles are formed. The mixture is then filtrated to

obtain a clear solution. Which of the following is correct if excess dilute hydrochloric acid is added to the clear

solution?

A. Gas bubbles are formed B. There is no visible change

C. A white precipitate is formed D. The clear solution turns brick red.


55

1. 1990/II/35

Which of the following hydroxides is insoluble in BOTH excess sodium hydroxide solution and excess

aqueous ammonia?

A. Cu(OH)2 B. Zn(OH)2 C. Fe(OH)2 D. Al(OH)2

2. 1992/II/32

Which of the following products are formed when nitrogen dioxide reacts with sodium hydroxide solution?

(1) sodium nitrite

(2) sodium nitrate

(3) nitrogen monoxide


3. 1995/II/7

Which of the following substances, when mixed, would undergo a chemical reaction?

A. copper and zinc sulphate solution

B. calcium chloride solution and magnesium nitrate solution

C. lead (II) nitride solution and sodium hydroxide solution

D. bromine water and sodium chloride solution

4. 1997/II/9

Metal X reacts with dilute nitric acid to give a colorless solution. When sodium hydroxide solution is added to

the solution, a white precipitate which dissolves in excess sodium hydroxide solution is formed. X is probably

A. copper B. iron C. lead D. magnesium

5. 1997/II/15

Which of the following substances, when mixed, would produce a precipitate?

A. chloride water and potassium bromide solution

B. ethyl ethanote and ethanol

C. iron (III) sulphate solution and aqueous ammonia

D. nitric acid and potassium hydroxide solution

6. 1997/II/37

Which of the following substances would react with sodium hydroxide solution?

(1) ammonium chloride solution (2) copper (II) sulphate solution (3) ethanoic acid


HKCEE CHEMISTRY | 4.2 Alkalis | P.1

56

7. 1998/II/25

Dilute sodium hydroxide solution is added successively to four different solutions. Which of the following

combinations is correct?

Solution Observation

A. Ammonium chloride White precipitate

B. Lead (II) nitrate Yellow precipitate

C. Potassium dichromate Orange precipitate

D. Iron (III) sulphate Brown precipitate

8. 1999/II/20

Which of the following solutions would produce a white precipitate with sodium hydroxide solution?

A. lead (II) nitrate solution B. iron (III) nitrate solution

C. copper (II)nitrate solution D. potassium nitrate solution

9. 2000/II/18

Some potassium carbonate solution is added to a sample of tap water. The mixture then appears cloudy.

Which of the following ions is probably present in the sample?

A. NH4+ B. Mg2

+ C. Br

– D. SO2

2–

10. 2000/II/22

A white solid dissolves in water to give an alkaline solution. The solution reacts with dilute hydrochloric acid to

give a gas. The solid is probably

A. calcium oxide. B. calcium carbonate. C. potassium hydroxide. D. potassium carbonate.

11. 2000/II/29

Which of the following compounds would react with ammonium chloride on heating?

A. concentrated nitric acid B. concentrated hydrochloric acid

C. sodium hydroxide solution D. magnesium sulphate solution

12. 2001/II/3

Which of the following processes is exothermic?

A. melting of ice B. evaporation of ethanol

C. sublimation of iodine D. dissolving of sodium hydroxide pellets in water

13. 2001/II/11

Which of the following pairs of solutions, when mixed, would produce a precipitate?

A. lead(II) nitrate and sodium hydroxide B. copper(II) sulphate and sodium nitrate

C. zinc chloride and potassium nitrate D. iron(II) sulphate and acidified potassium permanganate


57

14. 2002/II/17

Which of the following solutions does NOT react with sodium hydroxide solution?

A. ammonium chloride solution B. potassium carbonate solution

C. copper(II) nitrate solution D. zinc sulphate solution

15. 2002/II/24

Which of the following statements concerning sodium hydroxide is INCORRECT?

A. It is manufactured by treating sodium with water B. Its concentrated solution is corrosive

C. It is used in the manufacture of soapless detergents D. It absorbs carbon dioxide when exposed to air

16. 2003/II/45

1st statement 2

nd statement

Sodium hydroxide is an active ingredient in anti-acid tablets. Sodium hydroxide is a strong alkali.

17. 2004/II/34

Which of the following substances, when dissolved in water, gives a sodium with pH greater than 7?

(1) chlorine

(2) calcium oxide

(3) sulphur dioxide


18. 2006/II/7

Compound X is soluble in water. Addition of sodium hydroxide solution to a solution of X gives a white

precipitate. The precipitate does not dissolve upon the addition of excess alkali. X may be

A. MgCl2 B. ZnCl2 C. FeSO4 D. (NH4)2SO4


58

1. 1992/II/27

The following experimental results were obtained when 2 M HCl was allowed to react separately with 2M

NaOH and 2 M KOH:

Expt. No. Volume of acid Volume of alkali Rise in temperature

1 100cm3 of 2 M HCl

100cm

3 of 2 M NaOH

T1 °C

2 200cm3 of 2 M HCl

200cm

3 of 2 M NaOH

T2 °C

Which of the following is correct?

A. T1 = T2 B. T1 = 2T2 C. 2T1 = T2 D. 4T1 = T2

2. 1992/II/36

Which of the following reagents form(s) a white precipitate with lead(II) nitrate solution?

(1) potassium carbonate solution

(2) dilute hydrochloric acid

(3) sodium sulphate solution


3. 1994/II/5

The reaction between sodium hydrogencarbonate solution and zinc sulphate solution can be represented by the

following equation:

2NaHCO3 (aq) + ZnSO4 (aq) → Na2SO4 (x) + ZnCO3 (y) + H2O(z) + CO2 (g)


x y z

A. aq aq aq

B. aq aq l

C. aq s l

D. s aq l

4. 1995/II/12

Which of the following pairs of solutions , when mixed, would give a neutral solution?

A. 10 cm3 of 1 M sulphuric acid and 10 cm

3 of 1 M sodium hydroxide solution.

B. 10 cm3 of 1 M sulphuric acid and 10 cm


C. 10 cm3 of 2 M sulphuric acid and 20 cm


D. 20 cm3 of 2 M sulphuric acid and 10 cm


5. 1995/II/49

1st statement 2

nd statement

If a student accidentally spills some hydrochloric Sodium hydroxide solution can neutralize

acid on his hand, he should immediately wash his hydrochloride acid.

hand with sodium hydroxide solution.

HKCEE CHEMISTRY | 4.3 Neutralization & salts | P.1

59

6. 1996/II/4

Consider the following chemical equation :

2HNO3(aq) + CaCO3(x) → Ca(NO3)2(y) + H2O(z) + CO2(g)


x y z

A. aq aq l

B. aq aq aq

C. s aq l

D. s s aq

7. 1996/II/6

Which of the following substances is used by farmers to increase the pH of soil?

A. ammonium nitrate. B. calcium hydroxide. C. citric acid. D. potassium hydroxide.

8. 1996/II/10

A student added 16 cm3 of 2 M sodium hydroxide solution, in 2 cm

3 portions, to 10 cm

3 of 2 M nitric acid. He

measured the temperature of the mixture immediately after each addition of the sodium hydroxide solution.

Which of the following graphs represents the relationship between the temperature of the mixture and the volume

of sodium hydroxide solution added ?

A. B. C. D.

9. 1997/II/13

Which of the following statements concerning the reaction of aqueous ammonia with hydrochloric acid is

correct?

A. The reaction is exothermic.

B. A white precipitate is formed

C. Ammonium chloride and chloride are produced

D. The product ammonium chloride is a covalent compound

10. 1998/II/23

Which of the following is NOT the appropriate substance for preparing zinc sulphate by directly mixing

with dilute sulphuric acid?

A. zinc B. zinc carbonate C. zinc hydroxide D. zinc nitrate


60

11. 1998/II/31

What is the propose of adding quicklime (calcium oxide) to soil?

A. to neutralize the acidity of the soil B. to act as a fertilizer for the soil

C. to kill micro-organisms in the soil D. to increase the amount of calcium ions in the soil

12. 2003/II/43

Which of the following pairs of solutions would form a precipitate when they are mixed?

(1) NH4Cl(aq) and K2SO4 (aq)

(2) NH3 (aq) and Pb(NO3)2(aq)

(3) (NH4)2CO3(aq) and CaCl2 (aq)


13. 2004/II/8

Which of the following pairs of ions would react together to form a white precipitate?

A. Ca2+

(aq) and SO42–

(aq) B. Cu2+

(aq) and NO3– (aq)

C. Ni2+

(aq) and CO32–

(aq) D. NH4+

(aq) and OH–

(aq)

14. 2005/II/26

An aqueous solution of a compound reacts with dilute hydrochloric acid to give a gas. This aqueous solution

does not give a precipitate with sodium hydroxide solution. What could be the compound be?

(1) potassium sulphite

(2) iron(III) sulphate

(3) ammonium carbonate


15. 2007/II/38

Which of the following methods is most suitable for preparing a sample pf lead(II) sulphate?

A. adding lead to dilute sulphuric acid B. adding lead to copper(II) sulphate solution

C. adding lead(II) oxide to dilute sulphuric acid D. adding lead(II) nitrate solution to dilute sulphuric acid

16. 2008/II/45

In an experiment, a solution containing 3 moles of KOH reacts with another solution containing 1 mole of

an acid for complete neutralization. Which of the following deductions is/are correct?

(1) 1 mole of the acid provides 3 moles of H+ (aq) ions

(2) The acid is three times as concentrated as the KOH(aq)

(3) The acid is a strong acid



61

1. 1990/II/11

What volume of 0.5 M sulphuric acid is required to liberate 4.8 dm3of carbon dioxide at room temperature

and pressure from excess solid sodium hydrogencarbonate?

(Molar volume of gas room temperature and pressure = 24 dm3)

A. 0.2 dm3 B. 0.4 dm

3 C. 2.0 dm

3 D. 4.0 dm

3

2. 1990/II/12

150.0 cm3

of 3.0 M sodium solution is mixed with 50.0 cm3 of 1.0 M sodium hydroxide solution. The

concentration of the resultant solution is

A. 2.0 M B. 2.5 M C. 3.3 M D. 4.0 M

3. 1991/II/16

What volume of water should be added to 100 cm3

of 2 M hydrochloric acid to change the acid concentration

to 0.2 M?

A. 100 cm3 B. 500 cm

3 C. 900 cm

3 D. 1000 cm

3

4. 1991/II/20

What is the number of moles of Fe3+

ions in 0.1dm3 of 0.5 M Fe2 (SO4) 3 solution?

A. 0.1 × 0.5 B. 2 × 0.1 × 0.5 C. 0.1 × 0.5 × 6.02 × 1023

D. 2 × 0.1 × 0.5 × 6.02 × 1023

5. 1992/II/19

Solution X is 45 cm3 of 1.2 M HCl and Solution Y is 60 cm

3 of 0.9 M CH3COOH.

Which of the following statements concerning X and Y is correct?

A. X has a higher pH value than Y

B. Both X and Y need the same volume of 1 M NaOH for neutralization.

C. Both X and Y have the same electrical conductivity

D. Y has a faster rate of reaction with marble chips than X

6. 1992/II/29

After 50 cm3

of 0.6 M H2SO4 have completely neutralized 100 cm3

of 0.6 M NaOH, the concentration of the

resulting sodium sulphate solution is

A. 0.2 M B. 0.3 M C. 0.6 M D. 1.2 M

7. 1993/II/13

0.12 g of sodium metal is added to a large volume of water. When the reaction is completed, the resulting

solution is treated with 0.2 M hydrochloric acid. What is the volume of the acid required, to the nearest cm3,

for complete neutralization?

A. 13 B. 26 C. 39 D. 52

HKCEE CHEMISTRY | 4.4 Concentration of solution | P.1

62

8. 1995/II/16

What volume of water is required to dilute 100 cm3 of 8 M hydrochloric acid to a concentration of 2 M?

A. 200 cm3 B. 300 cm

3 C. 400 cm

3 D. 700 cm

3

9. 1997/II/6

A 2.0 M sodium chloride solution is prepared by dissolving 11.7 g of sodium chloride in distiller water.

What is the volume of the solution formed? (Relative atomic masses : Na = 23.0, Cl = 35.5)

A. 50.0 cm3 B. 100.0 cm

3 C. 250.0 cm

3 D. 500.0 cm

3

10. 1998/II/13

In an experiment, 10 cm3

of 1 M hydrochloric acid is added slowly into 10 cm3

of 1 M sodium hydroxide

solution . Which of the following statements concerning this experiment is correct?

A. The temperature of the mixture increases.

B. The pH of the mixture increases.

C. The mixture does not conduct electricity at the end of the experiment.

D. The concentration of sodium ions in the mixture remains unchanged.

11. 1999/II/6

The concentration of an aqueous solution of an acid is 1.0 M. 25.0 cm3 this acid solution requires 37.5 cm

3

of 2.0 M sodium hydroxide solution for complete neutralization. What is the basicity of the acid?

A. 1 B. 2 C. 3 D. 4

12. 1999/II/25

In an experiment, 1.00 M sodium hydroxide solution was added to 25.0 cm3 of 1.00 M sulphuric acid until

the acid was completely neutralized. What is the concentration of sodium sulphate (correct to two decimal places)

in the resulting solution?

A. 1.00 M B. 0.50 M C. 0.33 M D. 0.5 M

13. 2000/II/11

Different volumes of 2.0 M potassium hydroxide solution and 2.0 M sulphuric acid are mixed in a polystyrene

cup. In which of the following combinations would the temperature rise be the greatest?

Volume of 2.0 M KOH(aq)/cm³ Volume of 2.0 M H2SO4 (aq)/cm³

A. 20.0 40.0

B. 30.0 30.0

C. 40.0 20.0

D. 45.0 15.0


63

14. 2000/II/20

A sample of concentrated sulphuric acid has a density of 1.83 g cm-3

and contains 94.0% of sulphuric acid by

mass. What is the concentration (correct to one decimal place) of sulphuric acid in the sample?

(Relative atomic masses : H = 1.0, O = 16.0, S = 32.1)

A. 17.5 M B. 18.3 M C. 18.7 M D. 19.8 M

15. 2003/II/20

A sample of zinc granules of mass 1.8g was added to 100cm3 of 0.25 M hydrochloric acid. What is the

theoretical volume of hydrogen produced at room temperature and pressure?

(Relative atomic mass : Zn = 65.4 ; molar volume of gas at room temperature and pressure = 24dm3)

A. 0.30 dm3 B. 0.33 dm

3 C. 0.60 dm

3 D. 0.66 dm

3

16. 2003/II/26

20.0 cm3 of 2.0 M aqueous ammonia required 16.0 cm

3 of sulphuric acid for complete neutralization. What is the

concentration of the sulphuric acid? (Relative atomic masses : H = 1.0, O = 16.0, S = 32.1)

A. 61.3 g dm3 B. 122.6 g dm

3 C. 183.9 g dm

3 D. 245.2 g dm

3

17. 2005/II/22

500 cm3 of calcium hydroxide solution contains 3.7 g of calcium hydroxide. What is the molarity of the solution?

(Relative atomic masses: H = 1.0, O = 16.0, Ca = 40.1)

A. 0.05 M B. 0.10 M C. 0.13 M D. 0.26 M

18. 2005/II/34

Which of the following statements concerning 20 cm3 of 1 M CH3COOH and 10 cm

3 of 1 M H2SO4 is correct?

A. They has the same pH values

B. They have the same electrical conductivity

C. They react with magnesium at the same rate

D. They require the same number of moles of sodium hydroxide for complete neutralization

19. 2006/II/10

Solution X is prepared by mixing 100 cm3 of 2.0 M Na2SO4 (aq) with 50.0 cm

3 of 1.0 M NaNO3 (aq).

What is the concentration of Na+ (aq) ions in X?

A. 1.5 M B. 1.7 M C. 3.0 M D. 3.3 M

20. 2006/II/31

Oxalic acid is a dibasic acid. 10.0 cm3 of an aqueous solution of oxalic acid requires 30.0 cm

3 of

0.10 M KOH(aq) for complete neutralization. What is the concentration of the oxalic acid solution?

A. 0.15 M B. 0.20 M C. 0.30 M D. 0.60 M


64

21. 2006/II/39

Which of the following solutions when mixed with 50.0 cm3 of 1.0 M hydrochloric acid would NOT result in a

change in pH?

A. 50.0 cm3 of 1.0 M sodium chloride solution

B. 50.0 cm3 of 1.0 M ethanoic acid

C. 50.0 cm3 of 1.0 M nitric acid

D. 50.0 cm3 of 1.0 M sulphuric acid

22. 2007/II/17

20cm3 of calcium chloride solution contains 1.0 × 10

–2 moles of Cl

– (aq) ions. What is the molarity of the

solution?

A. 1.0 × 10–4

M B. 2.5 × 10–4

M C. 2.5 × 10–1

M D. 5.0 × 10–1

M

23. 2008/II/7

30.0 cm3 of 0.10 M KOH is completely neutralized by 20.0 cm

3 of dilute H2SO4 to form K2SO4 solution.

What is the molarity of the salt solution obtained?

A. 0.03 M B. 0.05 M C. 0.06 M D. 0.10 M

24. 2008/II/37

The following table shows some information on mixing hydrochloric acid with sodium hydroxide solution:

Mixture Temperature Rise / °C

25 cm3 of 1 M HCl + 25 cm

3 of 1 M NaOH w


3 of 1 M NaOH x


3 of 2 M NaOH y


3 of 2 M NaOH z

Which of the following concerning the values of temperature rise is correct?

A. w < x < y < z

B. w < x = y < z

C. w = y < x = z

D. w = x < y = z


65

1. 1991/II/13

Which of the following graphs represents what would be obtained on a thermometric titration of 2 M

hydrochloric with potassium hydroxide solution?

2. 1994/II/9

A metal X forms a hydroxide XOH. 1.12 g of XOH were dissolved some distilled water and then made up to

250 cm3 with distilled water. 25.0 cm³ of this solution required 20.0 cm

3 of 0.10 M hydrochloric acid for

complete neutralization. What is the relative atomic mass of X?

A. 23.0 B. 24.0 C. 39.0 D. 40.0

3. 1994/II/30

Q.3 and 4 refer to the following experiment on a thermometric titration.

A sulphuric acid solution is titrated against 25.0 cm³ of 3.0 M sodium hydroxide solution. The results of the

thermometric titration can be represented by the following graph:

The concentration of the sulphuric acid solution is

A. 1.00 M B. 1.25 M C. 2.50 M D. 5.00 M

4. 1994/II/31

Which of the following statement(s) is/are correct?

(1) The temperature rises from X to Y because the reaction between the sulphuric acid solution and sodium

hydroxide solution is exothermic

(2) The temperature drops from Y to Z because water is formed in the reaction between the sulphuric acid

solution and sodium hydroxide solution

(3) Z corresponds to the end point of the titration

A. (1) B. (2) C. (1) and (3) D. (2) and (3)

HKCEE CHEMISTRY | 4.5 Simple volumetric work | P.1

66

5. 1995/II/8

In order to prepare 250 cm³ of 10 M sodium hydroxide solution from 1.0 M sodium hydroxide solution,

which of the following combinations of apparatus should be used?

A. burette , measuring cylinder, pipette

B. conical flask, measuring cylinder, volumetric flask

C. burette, conical flask, wash bottle

D. pipette, volumetric flask, wash bottle

6. 1995/II/9

A student performed a titration in which he added an acid from a burette to an alkali contained in a conical flask.

The following diagrams show the initial and finial readings of the burette.

What was the volume of the acid added form the burette to the conical flask?

A. 24.5 cm3 B. 24.6 cm

3 C. 24.7 cm

3 D. 32.3 cm

3

7. 1997/II/49

1st statement 2

nd statement

When filling a pipette with a solution, a pipette It is more accurate to fill a pipette with a solution

filler is preferred to sucking with the mouth. by using a pipette filler than by sucking with the mouth.

8. 1998/II/16

The formula of a solid dibasic acid is H2X. 2.88 g of the acid is dissolved in some distilled water and the

solution is then diluted to 250.0 cm3 with distilled water . 25.0 cm

3 of the diluted solution requires 16.0 cm

3

of 0.40 M sodium hydroxide solution for complete neutralization. What is the molar mass of H2X?

A. 22.5 g B. 45.0 g. C. 90.0 g. D. 180.0 g.

9. 2001/II/15

A mixture consists of one mole of sodium carbonate and one mole of sodium hydrogencarbonate. What is the

least number of moles of hydrochloric acid required to liberate all the available carbon dioxide from the mixture?

A. 1.5 B. 2.0 C. 3.0 D. 4.0


67

10. 2001/II/34

In a titration experiment, 25.0 cm³ of diluted vinegar is titrated against a standard solution of sodium hydroxide

with phenolphthalein as indicator. Which of the following statements concerning this experiment is/are correct?

(1) The colour of phenolphthalein changes from colourless to pink at the end point.

(2) The colour of phenolphthalein changes from pink to colourless at the end point.

(3) A measuring cylinder is used to measure the volume of the diluted vinegar.


11. 2003/II/30

40 cm³ of 2 M hydrochloric acid was mixed with 40 cm³ of 2 M sodium hydroxide solution in a polystyrene cup

and the maximum rise in temperature was recorded. Which of the following pairs of solutions, upon mixing,

would produce a similar rise temperature?

A. 40 cm³ of 2 M ethanoic acid and 40 cm³ of 2 M potassium hydroxide solution

B. 40cm³ of 2 M ethanoic acid and 40 cm³ of 2 M ammonia solution

C. 40 cm³ of 2 M nitric acid and 40 cm³ of 2 M potassium hydroxide solution

D. 40 cm³ of 2 M nitric acid and 40 cm³ of 2 M ammonia solution

12. 2005/II/39

Questions 12 to 14 refer to the following information.

In an experiment to determine the concentration of sulphuric acid in a brad of toilet cleaner, 25.0 cm³ of the

cleaner was first diluted to 250.0 cm³ with distilled water. Upon titration with 0.950 M sodium hydroxide

solution using phenolphthalein as indicator, 25.0 cm³ of the diluted cleaner required 27.1 cm³ of the sodium

hydroxide solution to reach the end point. Which of the following types of apparatus should be used to measure

25.0 cm³ of the toilet cleaner?

A. pipette B. burette C. measuring cylinder D. volumetric flask

13. 2005/II/40

What is the colour change at the end point of the titration?

A. from colourless to pink B. from pink to colourless

C. from yellow to red D. from red to yellow

14. 2005/II/41

What is the concentration of sulphuric acid in the undiluted toilet cleaner?

A. 1.29 M B. 2.58 M C. 5.15 M D. 10.3M

15. 2006/II/47

In a titration experiment, which of the following apparatus should be rinsed with solution it is about to contain?

(1) burette (2) pipette (3) conical flask



68

16. 2007/II/15

What is the volume of 0.5 M hydrochloric acid required to react with 1.49 g of lithium oxide for complete

neutralization?

(Relative atomic masses : Li = 6.9 , O = 16.0)

A. 50 cm³ B. 100 cm³ C. 200 cm³ D. 260 cm³

17. 2008/II/43

Which of the following pieces of apparatus should be used when an acid is titrated with alkali?

(1) burette

(2) pipette

(3) conical flask



69

1. 1990/II/14

Which of the following statements concerning 25 cm³ of 1 M hydrochloric acid and 25 cm³ of 1 M ethanoic

acid is/are correct?

(1) They give the same colour change when same quantity of universal indicator is added

(2) They react with marble chips at the same rate when the initial temperatures are the same

(3) They require the same number of moles of sodium hydroxide for complete neutralization


2. 1991/II/39

In an experiment to study the rate of reaction, 100cm³ of 2 M hydrochloric acid are added to excess zinc

granules at room temperature. Which of the following modifications would increase the initial rate of reaction?

(1) The concentration of hydrochloric acid is 4 M instead of 2 M

(2) The volume of hydroxide acid is 200cm³ instead of 100cm³

(3) The hydrochloric acid is replaced by 100cm³ of 2 M sulphuric acid


3. 1991/II/50

1st statement 2

nd statement

Magnesium oxide dissolves faster in 1 M Hydrochloric acid is a stronger acid than ethanoic acid.

hydrochloric acid than in 1M ethanoic acid.

4. 1992/II/28

In the above graph, curve X was obtained by the reaction between 100 cm³ of 1 M HCl and excess zinc granules.

Which of the following changes would produce curve Y?

A. increasing the temperature by 10°C

B. adding the same amount of zinc powder instead of zinc granules

C. using 200 cm³ of 0.8 M HCl instead of 100cm³ of 1 M HCl

D. using 50 cm³ of 1.5 M HCl instead of 100cm³ of 1 M HCl

5. 1992/II/48

1st statement 2

nd statement

In the reaction between calcium carbonate The molar concentration of hydrochloric acid

and hydrochloric acid, the reaction rate decreases as the reaction between calcium

decreases with time. carbonate and hydrochloric acid proceeds.

HKCEE CHEMISTRY | 4.6 Rate of reaction | P.1

70

6. 1993/II/37

A mixture of ammonia and oxygen is passed over red hot platinum for a few minutes. Which of the following

graphs represents a plot of the mass of platinum against time?

7. 1993/II/38

The reaction between X(aq) and Y(aq) is represented by the following equation:

X(aq) + Y(aq) Z(aq)

Which of the following graphs represents the change of concentration of Y(aq) with time when fixed quantities

of X(aq) and Y(aq) are introduced into a closed container?

8. 1993/II/39

Q.8 and Q.9 refer to the following experiment on the study of the rate of reaction between hydrochloric acid

and sodium thiosulphate solution: 10 cm³ portions of 2.0 M hydrochloric acid were added to four separate

conical flasks each containing sodium thiosulphate solution which was prepared respectively as follows:

sodium thiosulphate solution conical flask

concentration volume volume of water

W 1.0 M 80 cm3 10 cm

3

X 1.5 M 60 cm3 30 cm

3

Y 2.5 M 30 cm3 60 cm

3

Z 3.0 M 20 cm3 70 cm

3

In which of the above conical flasks does the reaction proceed at the fastest rate?

A. W B. X C. Y D. Z

9. 1993/II/40

Which of the following apparatus should be used when carrying our the above experiment in addition

to the conical flasks?

(1) syringe (2) stop watch (3) measuring cylinder


10. 1993/II/49

1st statement 2

nd statement

100cm³ of 1 M hydrochloric acid react with excess Both acids contain the same concentration of H+ (aq) ions.

magnesium ribbon at the same rate as 100 cm³

of 1 M sulphuric acid.


71

11. 1994/II/26

Q.11 and 12 refer to the following experiment: 1.0 cm³ portions of a calcium chloride solution are added

successively to 10.0 cm³ of 1.0 M potassium carbonate solution in a test tube. After each addition, the

height of the precipitate formed is measured. The following graph is obtained:

The concentration of the calcium chloride solution is

A. 1.0 M B. 2.0 M C. 2.5 M D. 4.0 M

12. 1994/II/27

Which of the following statements concerning the experiment is INCORRECT?

A. The precipitate is white in colour

B. The precipitate is centrifuged before its height is measured

C. The height o precipitate formed at the end of the experiment would be the same if 150 cm³ portions of

the calcium chloride solution are used instead of 1.0 cm³ portions

D. A measuring cylinder is used to measure the 1.0 cm³ portions of the calcium chloride solution

13. 1994/II/28

A conical flask containing hydrochloric acid is placed on a top-pan balance. Some marble chips are carefully

added to the flask. Which of the following graphs represents the correct plot of the mass of the flask and its

content against time?

14. 1994/II/43

Which of the following statements concerning a catalyst are correct?

(1) It can change the rate of reaction.

(2) It can change the amount of product formed in a reaction.

(3) It remains chemically unchanged at the end of a reaction.



72

15. 1995/II/27

A certain amount of silver oxide is heated in a tested tube. Which of the following graphs represents the

correct plot of the mass of the contents of the test tube against time?

16. 1996/II/49

1st statement 2

nd statement

The volume of hydrogen liberated at room temperature and 10 M hydrochloric acid is a stronger

pressure by the reaction between 10 cm³ of 10 M hydrochloric acid than 2 M hydrochloric acid.

acid and excess zinc granules is greater than that between 50 cm³

of 2 M hydrochloric acid and excess zinc granules.

17. 1997/II/12

Which of the following graphs best represents the change in mass with time when calcium carbonate is strongly

heated?

18. 2005/II/50

1st statement 2

nd statement

2 M hydrochloric acid reacts faster with 1 g The surface area of 1 g of zinc powder is

of zinc granules than with 1 g of zinc powder. larger than that of 1 g of zinc granules.

19. 2006/II/44

Which of the following statements concerning a catalyst is are correct?

(1) A catalyst can alter the rate of reaction.

(2) The mass of a catalyst remains unchanged at the end of the reaction.

(3) A catalyst should be in the same physical state as the reactants.



73

20. 2007/II/35

Different metals are dropped into water or dilute hydrochloric acid. Assuming that the experimental conditions

are the same, which of the following comparisons concerning the initial rates of hydrogen formation is correct?

Initial rate of hydrogen formation Initial rate of hydrogen formation

A. Ca and H2O > Ba and HCl

B. Fe and HCl > K and H2O

C. K and H2O > Cs and H2O

D. Cs and H2O > Ca and H2O

21. 2007/II/47

A student pours two different acids respectively into two test tubes, each containing a piece of magnesium

ribbon of the same mass, until the ribbons are completely covered by the acids. If she wishes to compare the

relative strength of the acids by observing the initial rate of evolution of gas, which of the following items

should be the same?

(1) volume of the acids

(2) concentration of the acids

(3) basicity of the acids


22. 2008/II/39

Consider the following information on two reactions involving magnesium ribbons of the same shape:

Reaction mixture

Reaction 1 1.5 g of Mg + 100 cm³ of 1 M HCl

Reaction 2 1.5 g of Mg + 100 cm³ of 1 M H2SO4

Which of the following statements is correct? (Relative atomic mass : Mg = 24.3)

A. The magnesium reacts completely in Reaction 1

B. The sulphuric acid reacts completely in Reaction 2

C. The initial rate of Reaction 1 and Reaction 2 are the same

D. The initial rate of Reaction 1 is smaller than that of Reaction 2


74

1. 1996/II/46

1st statement 2

nd statement

Zinc-carbon dry cells are rechargeable. The electrolyte used in zinc-carbon dry cells is potassium hydroxide.

2. 1997/II/11

A zinc-carbon cell is connected to a voltmeter as shown in the above diagram. Which of the following

statements concerning the set-up is INCORRECT ?

A. Electrons flow from the zinc case to the carbon rod in the external circuit.

B. The zinc case gradually becomes thinner as the cell discharges.

C. Manganese (IV) oxide acts as an oxidizing agent.

D. Ammonium chloride acts as a reducing agent.

3. 2003/II/35

Which of the following is/are advantage(s) of using alkaline manganese cells over zinc-carbon cells in cassette

players?

(1) Alkaline manganese cells have longer life time

(2) Alkaline manganese cells are rechargeable

(3) Alkaline manganese cells give a more steady voltage over discharge


4. 2007/II/44

Which of the following statements concerning a zinc-carbon cell are correct?

(1) Manganese(IV) oxide acts as the anode

(2) Ammonium chloride acts as an electrolyte

(3) Zinc acts as the negative electrode


5. 2008/II/23

Which of the following is/are related to the use of silver oxide cells in watches?

(1) Silver oxide cells are rechargeable

(2) Silver oxide cells are small in size

(3) Silver is an expensive metal


HKCEE CHEMISTRY | 5.1 Chemical cells in daily life | P.1

75

1. 1990/II/24

Which of the following pairs of metals would be expected to give the largest voltage when they are used as

electrodes in a simple chemical cell using potassium nitrate solution as the electrolyte?

A. Zn and Pb B. Mg and Ag C. Pb and Cu D. Fe and Mg

2. 1992/II/9

Q.2 and 3 refer to the following diagrams:

Which of the following represents the correct order of activity of the metals P, Q, R and S?

A. R , P , Q , S B. Q , P , R , S C. P , Q , S , R D. P , R , S , Q

3. 1992/II/10

Which of the two metals used as electrodes would give the largest cell voltage?

A. Q and R B. Q and S C. S and R D. S and P

4. 1993/II/17

With reference to the above diagram, which of the following statements is correct?

A. The electrode made of metal X is the positive pole

B. Copper is at a higher position in the electrochemical series than metal X

C. The mass of the copper electrode decreases

D. The mass of the electrode made to metal X decreases

HKCEE CHEMISTRY | 5.2 Simple chemical cells | P.1

76

5. 1995/II/37

In the set-up shown metal X is more reactive than metal Y.

Which of the following statements concerning this set-up is/are correct?

(1) Electrolysis occurs inside the lemon

(2) Chemical energy is changed into electrical energy

(3) Electrons flow from metal Y to metal X in the external circuit


6. 1996/II/7

Which of the following metals would produce the smallest voltage in the above set-up?

A. iron B. aluminium. C. copper. D. magnesium.

7. 1996/II/27

Which of the following statements concerning the above set-up is correct?

A. Electrons flow from the lead electrode to the magnesium electrode through the external circuit

B. Electrons flow through the salt bridge

C. The mass of the lead electrode remains unchanged

D. Oxidation occurs at the magnesium electrode


77

8. 1998/II/21

Consider the following experiment.

Which of the following statements concerning the above experiment is correct?

A. Permanganate ions migrate into the salt bridge

B. Electrons flow from electrode X to electrode Y in the external circuit

C. Carbon electrodes are used because they are chemically inert

D. The half equation for the change occurring at electrode Y is Fe2+

+ 2e- → Fe

9. 1999/II/40

Consider the following chemical cell:

Which of the following changes would lead to an increase in the voltage of the cell?

(1) The zinc electrode is replaced with a magnesium electrode

(2) The copper electrode is replaced with an iron electrode

(3) The sodium chloride solution is replaced with a sugar solution



78

10. 2000/II/35

Consider the chemical cell shown below:

Which of the following statements concerning the cell is/are correct?

(1) Oxidation takes place at the copper electrode

(2) The concentration of magnesium ions in beaker X increases

(3) The salt bridge allows electrons to flow from one electrode to the other electrode


11. 2004/II/24

Which of the following combinations concerning the set-up shown below is correct after a current has flowed

through the external circuit for some time?

Mass of anode Colour intensity of the copper(II) sulphate solution

A. increase no change

B. decrease no change

C. increases decrease

D. decreases decreases


79

12. 2004/II/40

Consider the chemical cell shown below:

Which of the following statements concerning the cell are correct?

(1) Electrons flow from electrode X to electrode Y in the external circuit

(2) Oxidization occurs at electrode Y

(3) A blue colour appears in the KCl(aq) after the cell has operated for some time


13. 2006/II/33

In an experiment, a copper plate and a zinc plate in a beaker containing dilute sulphuric acid. The two metal plates

are touching each other as shown in the diagram below:

Which of the following statements correctly describers the observation in th experiment?

A. The solution in the beaker turns blue

B. The mass of the zinc plate remains unchanged

C. A white precipitates is formed in the beaker

D. Gas bubbles are formed on the surface of the copper plate

14. 2006/II/40

The set-up below shows a chemical cell connected to a voltmeter:

In the set-up, electrons flow in such a direction that the concentration of Cu2+

(aq) ions in each half cell

becomes the same eventually.

Which of the following statements concerning the set-up is correct?

A. The salt bridge allows electrons to flow from one half cell to the other

B. Oxidization occurs at Y

C. Electrons flow from Y to X in the external circuit

D. The mass of X will decrease but the mass of Y will increase


80

15. 2007/II/36

The following diagram represent a chemical cell called fuel cell.

Hydrogen and oxygen are passed into the fuel cell. The half equations for the chemical changes occurring at

electrode X and electrode Y are listed below:

At X : H2 + 2OH − → 2H2O + 2e −

At Y : O2 + 2H2O + 4e − → 4OH −

Which of the following statements concerning the fuel cell is correct?

A. Reduction occurs at X

B. A current flows from X to Y through the external circuit

C. Both H2 (g) and O2 (g) function as fuels in the cell

D. The fuel cell is an environmentally-friendly chemical cell

16. 2008/II/44

The following diagram shows the set6up of a chemical cell.

Given that Br2 (aq) is a stronger oxidizing agent than Fe3+

(aq), which of the cages represented by the

following half equations would occur if the cell is producing a current?

(1) Fe3+

(aq) + e– → Fe

2+ (aq)

(2) Fe2+

(aq) → Fe3+

(aq) + e–

(3) 2Br– (aq) → Br2 (aq) + 2e

–



81

1. 1990/II/1

Which of the following elements in the third period of the Periodic Table is the strongest reducing agent?

A. sodium B. sulphur C. chlorine D. aluminium

2. 1990/II/7

The reaction between lead(II) nitrate solution and sodium hydrogencarbonate solution can be represented by

the equation below:

Pb2+

(aq) + HCO3-

(aq) → PbCO3 (x) + H2O(y) + CO2(z)

Which of the following combinations for x, y and z is correct?

x y z

A. aq aq aq

B. aq l g

C. s aq g

D. s l g

3. 1990/II/19

In which of the following pairs of substances is the oxidation number of the sulphur atom and the nitrogen

atom the same?

A. H2SO4 and HNO3 B. SO2 and HNO2 C. SCl2 and NO D. NaHS and NH3

4. 1991/II/37

Which of the following oxidization numbers can nitrogen display in its compounds?

(1) –3 (2) +2 (3) +3 (4) +4

A. (1) and (4) only B. (2) and (3) only C. (1),(2) and (4) only D. (1),(2),(3),(4)

5. 1992/II/4

Consider the following table :

Element W X Y Z

Atomic number 9 10 14 19

Which of the following elements is likely to be an oxidizing agent?

A. W B. X C. Y D. Z

HKCEE CHEMISTRY | 5.3 Redox reaction | P.1

82

6. 1992/II/11

Consider the following flow diagram:

2+Reactant X Reactant YCuO (s) Cu (s) Cu (aq)→ →


Reactant X Reactant Y

A. H2 (g) dilute H2SO4

B. CO(g) dilute HNO3

C. NH3 (g) dilute HCl

D. C (s) concentration HCl

7. 1992/II/12

Using 1 mole of reactant, which of the following chemical changes involves the highest number of electrons?

A. CrO42-

(aq) → Cr3+

(aq) B. Cr2O72-

(aq) → Cr3+

(aq)

C. MnO42-

(aq) → Mn2+

(aq) D. MnO42-

(aq) → MnO2(s)

8. 1992/II/13

When 2 moles of oxygen gas are collected at the anode during the electrolysis of dilute sulphuric acid,

the number of moles of electrons released at the anode is

A. 2 B. 4 C. 6 D. 8

9. 1993/II/7

CO2(g) + CaCO3(x) + H2O(y) → Ca(HCO3)2(z)

In the above chemical equations, which of the following combinations is correct?

x y z

A. aq l aq

B. s aq s

C. s l s

D. s l aq

10. 1993/II/15

The oxidation number of copper remains unchanged when

A. magnesium ribbon is added to copper(II) sulphate solution

B. sodium carbonate solution is added to copper(II) nitrate solution

C. carbon is heated with copper(II) oxide

D. copper foil is burnt in chlorine


83

11. 1993/II/16

In which of the following equations does the underlined substance undergo reduction?

A. 2H2O + 2K → 2KOH + H2 B. Fe2(SO4)3 + 2KI → 2FeSO4 + K2SO4 + I2

C. 2H2S + SO2 → 3S + 2H2O D. NaClO + SO2 + H2O → NaCl + H2SO4

12. 1994/II/12

In which of the following experiments will a redox reaction occur?

A. adding copper turnings to iron(III) nitrate solution

B. adding bromine water to potassium chloride solution

C. adding iron filings to silver nitrate solution

D. adding sodium chloride solution to silver nitrate solution

13. 1994/II/17

In which of the following reactions does sulphur dioxide act as an oxidizing agent?

A. SO2 + 2Mg → 2MgO + S

B. SO2 + 2KOH → K2SO3 + H2O

C. SO2 + Cl2 + 2H2O → H2SO 4 + 2HCl

D. 5SO2 + 2KMnO4 + 2H2O → K2SO4 + 2MnSO4 + 2H2SO4

14. 1995/II/10

In which of the following equations does the underlined substances become reduced?

A. CuSO4 + Zn → ZnSO4 + Cu

B. 2FeCl2 + Cl2 → 2FeCl3

C. Pb(OH)2 + 2HNO3 → Pb(NO3)2 + 2H2O

D. MgCO3 + 2HCl → MgCl2 + CO2 + H2O

15. 1995/II/24

Consider the following equation:

2FeSO4．7H2O(x) → Fe2O3 (y) + SO3(z) + SO2(g) + 14 H2O (l)


x y z

A. aq s g

B. aq s l

C. s aq s

D. s s g


84

16. 1996/II/25

2 3 2 3

step 1 step 2 step 3 step 4N NH NO NO HNO→ → → →

Which step in the above flow chart involves the largest change in oxidation number of nitrogen?

A. step 1 B. step 2 C. step 3 D. step 4

17. 1997/II/8

Which of the following conversions involves the smallest change in oxidation number of the underlined element?

A. C(s) → CO2(g) B. NO3-(aq) → NO2(g)

C. SO32-

(aq) → SO42-

(aq) D. MnO4-(aq) → Mn

2+(aq)

18. 1997/II/27

Consider the following chemical equation:

O2 (g) + 4Fe(OH)2(x) → 2Fe2O3(y) + 4H2O(z)

Which of the following chemical combinations is correct?

x y z

A. s s l

B. s aq aq

C. aq s aq

D. aq aq l

19. 1998/II/4

Questions 19 and 20 refer to the following experiment:

The circuit shown below is set up and the solid lead (II) bromide is heated until it becomes molten.

Which of the following statements concerning the experiment is INCORRECT?

A. The bulb lights up B. A reddish brown gas is liberated at electrode X

C. Electrodes X and Y can be made of nichrome D. Oxidation occurs at electrode Y


85

20. 1998/II/5

Which of the following can be deduced from the experimental results?

A. Solid lead (II) bromide contains mobile ions

B. Molten lead (II) bromide contains delocalized electrons

C. Molten lead (II) bromide can be decomposed by electricity

D. Solid lead (II) bromide is a covalent compound but molten lead (II) bromide is an ionic compound

21. 1998/II/22

In Which of the following reactions does the underlined substance act as a reducing agent?

A. SO2 + 2H2S → 2S + 2H2O. B. Pb(NO3)2 + H2SO4 → PbSO4 + 2HNO3

C. 2HCl + MgO → MgCl2 + H2O D. 2KBr + Cl2 → 2KCl + Br2.

22. 1998/II/27


Zn + PMnO2 + qNH4+

→ Zn2+

+ xMn2O3 + yNH3 + zH2O


x y z

A. 1 2 1

B. 1 3 2

C. 2 3 2

D. 2 2 3

23. 1999/II/9

In which of the following reactions is the underlined reactant reduced?

A. Cu2+

+ 2OH- → Cu(OH)2 B. SO2 + 2Mg → 2MgO + S

C. 2NH3 +3CuO → 3Cu + N2+ 3H2O D. Zn + 2AgNO3 → Zn(NO3) +2Ag

24. 1999/II/15

Potassium permanganate solution acidified with dilute sulphuric acid is a commonly-used oxidizing agent.

Dilute nitric acid is not used to acidify potassium permanganate solution because

A. nitric acid is more expensive than sulphuric acid

B. dilute nitric acid is an oxidizing agent than sulphuric acid

C. nitric acid decomposes more readily than sulphuric acid

D. dilute nitric acid would react with potassium permanganate solution


86

25. 1999/II/21


2HNO3 + xFeSO4 + yH2SO4 → zFe2(SO4)3 + 4H2O + 2NO


x y z

A. 2 1 1

B. 4 3 2

C. 6 2 3

D. 6 3 3

26. 1999/II/33

Which of the following reactions will occur when aluminium powder is added to silver nitrate solution?

(1) Displacement (2) anodization (3) redox

A. (1) only B. (2) only. C. (1) and (3) only. D. (2) and (3) only.

27. 1999/II/36

The equation below represents the reaction of chlorine with hot concentrated potassium hydroxide solution:

3Cl2(g) + 6KOH(aq) → 5KCl(aq) + KClO3(aq) + 3H2O(l)

Which of the following statements concerning this reaction is/are correct?

(1) Potassium hydroxide acts as a reduces agent

(2) The oxidation number of chlorine changes from 0 to –1

(3) The oxidation number of chlorine changes from 0 to +5

A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only.

28. 2000/II/16

Consider the following equation : 3Zn(s) + 2NO3− (aq) + 8H + (aq) → 3Zn +2 (x) + 2NO(y) + 4H2O(z)


x y z

A. aq g aq

B. aq g l

C. aq aq l

D. l g aq

29. 2000/II/28

Which of the following changes is NOT a redox reaction?

A. Fe2(SO4)3 + H2S → 2FeSO4 + S + H2SO4

B. 2Al + 6HCl → 2AlCl3 + 3H2

C. CaCO3 + CO2 + H2O → Ca(HCO3) 2

D. 2KClO3 → 2KCl + 3O2


87

30. 2000/II/30

In which of the following substances does nitrogen has the smallest oxidation number?

A. NH3 B. NO C. N2O D. N2

31. 2001/II/22

Which of the following equations represents a redox reaction?

A. NH4+ (aq) + OH − (aq) → NH3 (g) + H2O (l)

B. 2CrO4−2 (aq) + 2H + (aq) → Cr2O7

−2 (aq) + H2O(l)

C. 2FeSO4 (s) → Fe2O3 (s) + SO3 (g) + SO2 (g)

D. 2NaHCO3 (s) → Na2CO3 (s) + H2O(l) + CO2 (g)

32. 2001/II/24

Consider the half equation :

IO3– (aq) + xH2O (l) + ye

– → I

– (aq) + zOH

– (aq)


x y

A. 1 2

B. 2 4

C. 3 6

D. 4 8

33. 2001/II/29

The oxidation number of lead in [Pb(OH) 4]2–

is

A. –2 B. +2 C. +4 D. +6

34. 2002/II/7

Sodium chromate, Na2CrO4, dissolves in water to give a yellow solution. When dilute hydrochloric acid is

added to the solution, the following reaction occurs : 2CrO4−2 (aq) + 2H + (aq) → Cr2O7

−2 (aq) + H2O(l)

Which of the following statements concerning this reaction is correct?

A. The colour of the solution changes from yellow to green

B. Chromate ions act as a reducing agent

C. The oxidation number of oxygen remains unchanged during the reaction

D. The reaction is neutralization

35. 2002/II/13

Which of the following equations represents a redox reaction?

A. Ca(HCO3)2 + 2HCl → CaCl2 + 2CO2 + 2H2O

B. PCl3 + Cl2 → PCl5

C. Fe +3 + 3OH −→ Fe(OH)3

D. Al2O3 + 2NaOH → 2NaAlO2 + H2O


88

36. 2002/II/18

The symbol of vanadium is V. What is the oxidation number of vanadium in NH4VO3?

A. –1 B. +3 C. +5 D. +6

37. 2003/II/16

Which of the following conversions is NOT a reduction?

A. Fe2O3 → Fe B. Cu(OH)2 → CuO

C. CH3CO2H → CH3CH2OH D. H2SO4 → SO2

38. 2003/II/23

Consider the following equation:

5H2S(g) + 2KMnO4 (aq) + 3H2SO4 (aq) → 5S(x) + 8H2O(y) + 2MnSO4 (z) + K2SO4 (aq)


x y z

A. s aq aq

B. s l aq

C. aq aq s

D. aq l s

39. 2003/II/24

What is the oxidation number of sulphur in H2S2O7?

A. +2 B. +4 C. +6 D. +8

40. 2004/II/7

In which of the following compounds does sulphur exhibit the lowest oxidation number?

A. Na2S2O3 B. MgSO4 C. KHSO3 D. H2S2O7

41. 2004/II/32

Which of the following substances decolorize acidified potassium permanganate solution?

(1) sodium nitrate solution (2) sodium sulphite solution (3) chlorine water


42. 2004/II/39

Which of the following gases can act as reducing agents?

(1) ammonia (2) hydrogen (3) fluorine



89

43. 2005/II/8

Which of the following is NOT a redox reaction?

A. NH4NO3 → N2O + 2H2O

B. NH3 + HNO3 → NH4NO3

C. N2O4 + H2O → HNO2 + HNO3

D. 4HNO3 → 2H2O + 4NO2 + O2

44. 2005/II/30

1st statement 2

nd statement

Iodine can displace chlorine from potassium chloride solution. Iodine is a stronger oxidizing agent than

chlorine.

45. 2006/II/3

What is the oxidation number of cobalt in Co(NH3)4Cl2?

A. –2 B. 0 C. +2 D. +6

46. 2006/II/8

Consider the following chemical equation :

x VO2+ (aq) + y H

+ (aq) + 2I

- (aq) → x VO

2+ (aq) + z H2O (l) + I2 (aq)

(V is the symbol for the element vanadium.)


x y z

A. 1 2 1

B. 1 4 2

C. 2 4 2

D. 3 6 3

47. 2006/II/27

Which of the following reactions involve oxidation and reduction?

(1) 2KClO3 (s) → 2KCl(s) + 3O2 (g)

(2) Pb(s) + PbO2 (s) + 2H2SO4 (aq) → 2PbSO4 (s) + 2H2O(l)

(3) H2O2 (aq) + H2SO4 (aq) + 2Kl(aq) → K2SO4 (aq) + I2 (aq) + 2H2O(l)



90

48. 2006/II/38

Consider the conversions between three nitrogen compound shown in the flow diagram below:


A. Reaction 1 occurs spontaneously when nitrogen monoxide is exposed to air

B. The oxidation number o nitrogen remains unchanged in Reaction 2

C. Reaction 3 can be brought about by adding very dilute nitric acid to magnesium

D. Reaction 4 can be brought about by adding concentrated nitric acid to copper

49. 2007/II/24

Consider the redox reaction represented by the equation below:

2S2O32–

(aq) + I2 (aq) → S4O62-

(aq) + 2I– (aq)

Which of the following statements is/are correct?

(1) The oxidation number of sulphur in S2O32–

(aq) is +3

(2) One of the half equation of this reaction is 2S2O32–

(aq) → S4O62–

(aq) + 2e–

(3) I2 (aq) is oxidized by S2O32–

(aq) in the reaction


50. 2008/II/4

Consider the ionic equation below:

2MnO4– + xSn

2+ + yH

+ → 2Mn

2+ + xSn

4+ + 8H2O

What is the value of x?

A. 2 B. 4 C. 5 D. 7

51. 2008/II/5

In which of the following compounds is the oxidation number of nitrogen lowest?

A NH4Cl B. NaNO2 C. NH2OH D. Pb(NO3) 2


91

52. 2008/II/15

X and Z are metals. X reacts with Z(NO3)2 solution according to the following equation:

X(s) + Z2+

(aq) → X2+

(aq) + Z(s)

Which of the following deductions is correct?

A. Both X and Z can react with water

B. The reactivity of Z is higher than that of X

C. X acts as a reducing agent in the reaction

D. Z acts as the negative pole when X and Z are used as electrodes in a chemical cell with sodium chloride

solution as electrolyte

53. 2008/II/16

The oxidation number of metal M in its oxide is +2. Complete reduction of 11.9 g of this oxide by hydrogen

gas produces metal M and 2.7 g of water. What is the relative atomic mass of M?

(Relative atomic masses : H = 1.0, O = 16.0)

A. 9.3 B. 24.3 C. 63.3 D. 137.3

54. 2008/II/36

Which of the following processes does NOT involve redox reaction(s)?

A. bromination of methane B. electrolysis of sea water

C. thermal decomposition of limestone D. removal of air pollutants in car exhaust by catalytic convector

55. 2008/II/40

A compound is composed of element Z and hydrogen. Electrolysis of this compound under molten state

produces the same number of Z atoms at the cathode as hydrogen molecules at the anode. The following half

equation shows the change occurring at the anode:

2H– → H

2 + 2e

–

What is the oxidation number of Z in this compound?

A. –2 B. –1 C. +1 D. +2


92

1. 1990/II/23

A student tries to plate a copper ring with nickel using the set-up below:


Anode Cathode Electrolyte

A. copper ring nickel rod Ni2+

(aq)

B. nickel rod copper ring Ni2+

(aq)

C. copper ring nickel rod Cu2+

(aq)

D. nickel rod copper ring Cu2+

(aq)

2. 1991/II/6

Questions 2 and 3 refer to the following electrolysis experiment.

The gas collected at electrodes X and Y respectively are in the volume ratio of

A. 1 : 1 B. 1 : 2 C. 1 : 4 D. 2 : 1

3. 1991/II/7

Which of the following statements concerning the experiment is/are correct?

(1) The pH value of the potassium sulphate solution remains unchanged at the end of the experiment

(2) The concentration of the potassium sulphate solution remains unchanged at the end of the experiment

(3) The products of electrolysis at electrodes X and Y would remain unchanged if 2 M sulphuric acid were

used instead of 2 M potassium sulphate solution


4. 1991/II/47

1st statement 2

nd statement

Distilled water is a poor conductor of electricity. Distilled water contains an equal number of H+ (aq) ions

and OH–(aq) ions.

HKCEE CHEMISTRY | 5.4 Electrolysis | P.1

93

5. 1992/II/37

Which of the following aqueous solutions, when electrolyzed using carbon electrodes, will liberate only gaseous

products at both electrodes?

(1) KOH(aq)

(2) AgNO3(aq)

(3) MgCl2 (aq)


6. 1993/II/19

In the above experiment, which of the following major products will be liberated at the electrodes?

cathode anode

A. magnesium oxygen

B. magnesium bromine

C. hydrogen bromine

D. hydrogen oxygen

7. 1994/II/4

Both rubidium (Rb) and sodium are elements in Group I of the Periodic Table, but rubidium is more reactive

than sodium. When a rubidium hydroxide solution is electrolyzed using platinum electrodes, hydrogen gas is

liberated at cathode.

Which of the following statements is a correct explanation for the phenomenon described above?

A. The H+(aq) ion accepts an electron more readily than the Rb

+ (aq) ion

B. The H+ (aq) ion is more mobile than the Rb

+ (aq) ion and migrates faster to the cathode

C. Rubidium is first liberated, but it reacts immediately with water to give hydrogen gas

D. The concentration of H+ (aq) ion is higher than that of Rb

+ (aq) ions in the rubidium hydroxide solution

8. 1994/II/13

When a substance X is electrolyzed using platinum electrodes, a gas is collected at each electrode. X may be

A. silver nitrate solution B. potassium chloride solution

C. molten sodium chloride D. molten copper(II) chloride


94

9. 1995/II/11

A student tries to electroplate an iron ring with nickel using the set-up shown below?


Solution X Anode Cathode

A. Iron (II) sulphate solution Iron ring Nickel rod

B. Iron (II) sulphate solution Nickel rod Iron ring

C. Nickel (II) sulphate solution Iron ring Nickel rod

D. Nickel (II) sulphate solution Nickel rod Iron ring

10. 1996/II/30

Q.10 and Q.11 refer to the following experiment.


Gas X Gas Y Gas X Gas Y

A. Chloride Hydrogen B. Chloride Oxygen

C. Hydrogen Chloride D. Oxygen Hydrogen

11. 1996/II/31

Which of the following statements concerning the above experiment is/are correct?

(1) Platinum electrodes should be used

(2) The concentration of Na+ (aq) ions around the cathode increase

(3) The solution changes from colorless to pink


12. 1996/II/35

In which of the following processes will lead be produced?

(1) the electrolysis of molten lead (II) bromide

(2) heating lead (II) oxide strongly

(3) adding magnesium to lead (II) nitrate solution



95

13. 1996/II/38

Which of the following substance are commonly found in the waste water produced by electroplating factories?

(1) acids

(2) alkalis

(3) cyanides


14. 1997/II/7

During the electrolysis of 1 M copper (II) chloride solution using copper electrodes, which of the following

changes would occur at the electrodes?

Cathode Anode

A. Hydrogen liberated Chloride liberated

B. Copper deposited Chloride liberated

C. Copper dissolved Copper deposited

D. Copper deposited Copper dissolved

15. 1999/II/42

Consider the following experiment:

Which of the following statements concerning the experiment are correct?

(1) Gas bubbles are evolved at electrode X

(2) An orange color gradually appears in the solution around electrode Y

(3) The experiment can be used to show that ions migrate towards oppositely charged electrodes


16. 2000/II/5

Which of the following gases are the major products liberated in the electrolysis of concentrated sodium chloride

solution using carbon electrodes?

Cathode Anode

A. hydrogen chlorine

B. chlorine hydrogen

C. hydrogen oxygen

D. oxygen hydrogen


96

17. 2001/II/44

Consider the set-up shown below :


(1) The solution around electrode X turns brown

(2) The mass of electrode X remains unchanged

(3) Reduction occurs at electrode Y


18. 2002/II/10

Consider the set-up shown below :

Electrons flow from X to Y in the external circuit. Which of the following combinations is correct?

X Y Z

A. carbon silver silver nitrate solution

B. zinc magnesium magnesium sulphate solution

C. carbon carbon copper(II) sulphate solution

D. zinc carbon silver nitrate solution

19. 2002/II/47

1st statement 2

nd statement

During electrolysis, oxidation takes place at the cathode. Cations accept electrons and are

discharged at the cathode.

20. 2003/II/15

In the electrolysis of a copper(II) sulphate solution, copper is used as the anode and carbon as the cathode.

Which of the following statements concerning this electrolysis is correct?

A. The concentration of Cu2+

(aq) ions in the solution remains unchanged

B. The concentration of H+ (aq) ions in the solution increases

C. O2 (g) is liberated at anode

D. H2 (g) is liberated at cathode


97

21. 2004/II/43

In which of the following processes would hydrogen be produced?

(1) electrolysis of an aqueous solution of potassium bromide

(2) passing steam over heated iron powder

(3) adding zinc granules to dilute ethanoic acid


22. 2005/II/31

In which of the following combinations will oxygen be produced as the major product at the anode during

electrolysis?

electrolyte cathode anode

A. 0.1M CuCl2 platinum platinum

B. 0.1 M CuCl2 copper copper

C. 5 M HCl platinum platinum

D. 5 M HCl copper copper

23. 2007/II/45

Using carbon as electrodes, which of the following solutions would give hydrogen upon electrolysis?

(1) 1 M silver nitrate solution

(2) 2 M sodium hydroxide solution

(3) 3 M calcium chloride solution


24. 2008/II/48

Upon electrolysis, which of the following solutions would give hydrogen at carbon dioxide and oxygen at

platinum anode?

(1) very dilute sodium chloride solution

(2) dilute copper(II) sulphate solution

(3) concentrated potassium sulphate solution



98

1. 1991/II/10

Dry chlorine is passed in excess over heated copper powder and iron powder as shown in the diagram below:

What is/are the product(s) at the end of the experiment?

A. copper(II) chloride only B. iron(II) chloride only

C. copper(II) chloride and iron(II) chloride D. copper(II) chloride and iron(III) chloride

2. 1991/II/21

Iron(III) sulphate solution is mixed with chlorine water. Excess aqueous ammonia is then added to the mixture.

What is the colour of the precipitate formed?

A. white B. yellow C. green D. brown

3. 1992/II/38

Which of the following statements concerning the reaction between dry chlorine and hot iron wire is/are correct?

(1) Iron(II) chloride is formed

(2) A solid product is obtained after cooling to room temperature

(3) Chlorine is reduced


4. 1994/II/14

Some chlorine water was exposed to sunlight(Diagram A); a gas X was collected after some time(Diagram B).

Which of the following statements concerning gas X is correct?

A. It can relight a glowing splint B. It has a pungent smell

C. It can turn wet blue litmus paper red and then white D. It can give a 'POP' sound with a burning splint

5. 1994/II/21

A solution of chlorine in tetrachloromethane is shake with an aqueous solution of a compound X in a test tube.

On standing, two layers are formed in the test tube and the lower layer is violet in colour. X may be

A. sodium fluoride B. sodium bromide C. sodium iodide D. sodium sulphite

HKCEE CHEMISTRY | 6.1 Chlorine & hypochlorite | P.1

99

6. 1994/II/49

1st statement 2

nd statement

Iron reacts with chlorine to form iron(II) chloride. Iron is a reducing agent in this reaction.

7. 1996/II/21

Which of the following statements concerning chloride is INCORRECT?

A. It can kill germs

B. It can turn bromine water colorless

C. It can oxide iodide ions to iodide molecules

D. It can be produced by the reaction between dilute sulphuric acid and sodium hypochlorite solution

8. 1997/II/21

The following equation represents the reaction of chloride with dilute sodium hydroxide solution at room

temperature:

Cl2 (g) + 2NaOH (aq) → NaCl (aq) + NaClO (aq) + H2O (l)

Which of the following statements concerning this reaction is correct?

A. chloride is oxidized and sodium hydroxide is reduced

B. chloride is reduced and sodium hydroxide is reduced

C. chloride is simultaneously oxidized and reduced

D. sodium chloride is simultaneously oxidized and reduced

9. 1998/II/42

Which of the following statements concerning the gas produced in the above experiment are correct?

(1) It is toxic.

(2) It is readily soluble in 1, 1, 1-trichloroethane.

(3) It can turn red litmus solution blue and then colorless.



100

10. 1999/II/10

Which of the following statements concerning bromine and chlorine is INCORRECT?

A. They exist as diatomic molecules

B. Their atoms have the same number of outermost shell electrons

C. They form ions with a single negative charge

D. Bromine is a stronger oxidizing agent than chlorine

11. 1999/II/29

Which of the following statements concerning household bleach is correct?

A. The active ingredient of household bleach is sodium hydroxide

B. Household bleach is produced by dissolving chlorine in water

C. Household bleach can be used as a drain opener

D. The raw material for manufacturing household bleach is sodium chloride

12. 2000/II/47

1st statement 2

nd statement

Chlorine is a better bleaching agent for silk than sulphur dioxide. Chlorine bleaches by reduction.

13. 2001/II/33

Consider the information below about the reaction of hydrogen with chlorine:

H2 (g) + Cl2 (g) → 2HCl(g) ∆H < 0

Which of the following statement can be deduced from the above information?

(1) Heat is liberated when hydrogen chloride is formed

(2) Hydrogen and chlorine react at room temperature

(3) When measured at room temperature and pressure, the total gas volume before the reaction equals that

after the reaction


14. 2001/II/40

In which of the following experiments would a gas be produced?

(1) adding water to a solid mixture of citric acid and sodium hydrogencarbonate

(2) adding dilute hydrochloric acid to sodium hypochlorite solution

(3) adding chlorine water to potassium iodide solution


15. 2002/II/6

Compound X dissolves in water to give a colourless solution. When chlorine gas is bubbled into the solution,

the solution turns brown. X is probably

A. ammonium iodide. B. iron(II) sulphate. C. sodium sulphite. D. potassium hydroxide.


101

16. 2003/II/7

Which of the following statements concerning halogens is INCORRECT?

A. Compounds of fluorine are added to tap water to help prevent tooth decay

B. Chlorine is used as a sterilizing agent

C. Bromine is a volatile liquid

D. Iodine vapour is brown in colour

17. 2003/II/13

Which of the following substances will NOT react with bromine water?

A. propene B. sulphur dioxide C. potassium iodide solution D. ammonium chloride solution

18. 2003/II/22

X is a bleaching agent. X bleaches a dye by oxidation and becomes Y at the end of the reaction. Which of the

following combinations is correct?

X Y

A. Cl2 (aq) Cl– (aq)

B. Cl2 (aq) OCl–

(aq)

C. SO2 (aq) SO32–

(aq)

D. SO2 (aq) SO42–

(aq)

19. 2003/II/27

Which of the following pairs of substances can be distinguished by using dilute hydrochloric acid?

A. NaCl and NaOCl B. NH4Br and NH4I

C. K2CO3 and KHCO3 D. CaO and Ca(OH)2

20. 2003/II/44

Which of the following statements concerning chlorine are correct?

(1) It turns blue litmus solution red and then colourless

(2) It is used to manufacture sodium chloride

(3) It is denser than air


21. 2004/II/14

Chlorine can be prepared from concentrated hydrochloric acid and potassium permanganate according to the

following equation:

2KMnO4+ xHCl → 2KCl + 2MnCl2 + yH2O + zCl2

What is the value of z?

A. 4 B. 5 C. 6 D. 10


102

22. 2004/II/18

Which of the following reagents can be used to distinguish sodium bromide solution from sodium chloride

solution?

A. bromine water B. chlorine water C. 1,1,1-trichloroethane D. potassium fluoride solution

23. 2004/II/22

The main chemical constituent of bleaching powder is calcium hydrochloride. Which of the following statements

concerning bleaching powder is INCORRECT?

A. It works effectively with soaps in cleaning processes B. It can be used as a domestic sterilizing agent

C. It reacts with acids readily to give chlorine D. It bleaches by oxidation

24. 2004/II/36

Chlorine is manufactured by the electrolysis of brine. Which of the following products can also be obtained

in the manufacturing process?

(1) hydrogen (2) sodium hydroxide (3) sodium hypochlorite


25. 2005/II/30

1st statement 2

nd statement

Iodine can displace chlorine from potassium chloride solution. Iodine is a stronger oxidizing agent than chlorine

26. 2006/II/36

A company plans to set up a chemical plant for the manufacture of chlorine bleach in a town. Which of the

following factors is the LEAST important to be considered in the planning stage?

A. cost for waste disposal B. cost for compliance with air pollution control

C. price of electricity D. price of sodium chloride

27. 2007/II/19

Chlorine is bubbled into an aqueous solution P for some time. The colour of gradually changes to brown.

P is NOT likely to be

A. calcium hydroxide solution B. potassium iodide solution

C. iron(II) chloride solution D. zinc bromide solution

28. 2007/II/37

Which of the following mixtures can produce chlorine?

A. chlorine bleach and lemon juice B. sodium chloride and vinegar

C. polyvinyl chloride and caustic soda D. hydrochloric acid and limestone


103

29. 2008/II/21

Which of the following substances, when mixed with bromine water, would form a colourless solution?

(1) sodium sulphite

(2) sodium chloride

(3) sodium iodide



104

1. 1990/II/16

Sulphuric acid is NOT used to prepare carbon dioxide from limestone because

A. the reaction between sulphuric acid and limestone is reversible

B. the reaction between sulphuric acid and limestone is too vigorous

C. sulphuric acid is a strong oxidizing agent

D. an insoluble product is formed which stops further reaction

2. 1990/II/28

Which of the following are important uses of sulphur dioxide?

(1) as a food preservative

(2) as a bleaching agent in the paper industry

(3) in the manufacture of sulphuric acid


3. 1990/II/47

1st statement 2

nd statement

The bleaching action of sulphur dioxide is not permanent. Sulphur dioxide reacts with water to form a weak

acid

4. 1991/II/14

Sulphur dioxide is passed into a test tube containing potassium dichromate solution acidified with dilute sulphuric

acid. The colour of the solution gradually changes from orange to green.

Which of the following statements concerning the above experiments correct?

A. Sulphur dioxide is oxidized to sulphate

B. The green colour is due to the presence of Cr2+

(aq) ions

C. The dilute sulphuric acid acts as a catalyst

D. The oxidation number of chromium changes from +7 to +2 in the reaction

5. 1991/II/17

When concentrated sulphuric acid is added to hydrated copper(II) sulphate crystals, which of the following

would be observed?

A. The crystals dissolve to form a blue solution B. The crystals change to a white solid

C. The crystals change to a black solid D. There is no visible change

6. 1991/II/44

Which of the following gases can be dried by concentrated sulphuric acid?

(1) hydrogen chloride (2) ammonia (3) sulphur dioxide

A. (3) only B. (1) and (2) only C. (1) and (3) only D. (2) and (3) only

HKCEE CHEMISTRY | 6.2 Sulphuric acid and sulphur dioxide | P.1

105

7. 1992/II/8

The manufacture of sulphuric acid can be represented by the following flow diagram:

4272232 SOHIV Stage

OSHIII Stage

SOII Stage

SO I Stage

S → → → →

Which stage involves the greatest change is the oxidation number of sulphur?

A. Stage I B. Stage II C. Stage III D. Stage IV

8. 1992/II/15

Which of the following statements react with hot concentrated sulphuric acid?

(1) sulphur (2) sodium nitrate (3) hydrated copper(II) sulphate


9. 1992/II/16

When sulphur dioxide is bubbled into sodium hydroxide solution for a long time, the final product is

A. sodium sulphite B. sodium sulphate C. sodium hydrogen sulphite D. sodium hydrogen sulphate

10. 1992/II/17

Q.10 and 11 refer to the following experiment:

A student measured the conductivity of a certain acid. When he added barium hydroxide solution dropwise

to the acid, he found that the conductivity of the acid gradually dropped to almost zero.

The acid is probably

A. hydrochloric acid B. sulphuric acid C. nitric acid D. ethanoic acid

11. 1992/II/18

Which of the following reasons accounts for the change in the conductivity of the acid?

A. Barium hydroxide is a weak electrolyte

B. The acid is weak electrolyte

C. The neutralization reaction between barium hydroxide solution and the acid is exothermic

D. A precipitate is formed when barium hydroxide solution is added to the acid

12. 1992/II/46

1st statement 2

nd statement

Sulphur dioxide is an oxidizing agent. Sulphur dioxide can decolorize bromine water.

13. 1992/II/50

1st statement 2

nd statement

When concentrated sulphuric acid is poured onto Concentrated sulphuric acid is a strong oxidizing agent.

a piece of cotton cloth, the piece of cloth becomes

charred.


106

14. 1993/II/22

Which of the following reactions would product a halogen?

(1) sodium chloride + concentrated sulphuric acid

(2) sodium bromide + concentrated sulphuric acid

(3) sodium iodide + concentrated sulphuric acid


15. 1993/II/25

Which of the following properties apply to sulphur dioxide?

(1) It bleaches dry litmus paper

(2) It decolorizes bromine water

(3) It supports the burning of magnesium ribbon


16. 1993/II/44

Which of the following statements is INCORRECT?

A. Tin is used for making food cans

B. Sulphuric acid is used for making soap

C. Ammonium chloride is used for making dry cells

D. Chlorine is used for sterilizing drinking water

17. 1993/II/45

1st statement 2

nd statement

Concentrated sulphuric acid can be used to prepare Sulphuric acid is more volatile than nitric acid

nitric acid. (Out of Syll.)

18. 1994/II/38

Concentrated sulphuric acid turns blue litmus paper red and then black. On the basis of these colour changes,

which of the following deductions concerning concentrated sulphuric acid are correct?

(1) It contains H+ (aq) ions

(2) It is an oxidizing agent

(3) It is a dehydrating agent



107

19. 1995/II/13

The reaction of cane sugar and concentrated sulphuric acid may be represented by the following equation.

2 4co n c. H S O

1 2 2 2 1 1 2C H O (s) 12C (s) + 11H O (l) →

In this reaction, concentrated sulphuric acid acts as

A. a strong acid B. an oxidizing agent C. a drying agent D. a dehydrating agent

20. 1995/II/38

Which of the following statements concerning the contact process is/are correct?

(1) The sulphur dioxide used in the process can be produced by roasting sulphide ores

(2) A gaseous mixture of sulphur dioxide and oxygen in the mole ratio of 1 : 2 is passed into the catalytic

conversion chamber

(3) The sulphur trioxide produced is absorbed by water in the absorption tower


21. 1996/II/9

Which of the following experiments can be used to show that concentrated sulphuric acid is a dehydrating agent?

A. adding it to copper (II) oxide powder B. adding it to copper (II) sulphate crystals

C. adding it to calcium carbonate power D. adding it to sodium chloride crystals

22. 1996/II/37

In which of the following reactions does sulphur dioxide act as a reducing agent?

(1) the production of sulphuric acid in the contact process

(2) the bleaching of a red petal

(3) the decolorization of bromine water


23. 1997/II/29

An iron nail is heated with concentrated sulphuric acid. Which of the following combinations is correct?

Gas given off Color of solution formed

A. hydrogen pale green

B. hydrogen yellow

C. sulphur dioxide pale green

D. sulphur dioxide yellow


108

24. 1997/II/39

Concentrated sulphuric acid is corrosive to skin because

(1) it is a dehydrating agent

(2) it is an oxidizing agent

(3) each molecular of sulphuric acid has two ionizable hydrogen atoms

Which of the above statements are correct?


25. 1997/II/45

1st statement 2

nd statement

Newspaper gradually turn yellow in air. Sulphur-containing pollutants are present in air.

26. 1998/II/30

Which of the following steps is NOT included in the Contact Process for the manufacture of sulphuric acid?

A. burning sulphur in air to form sulphur dioxide

B. oxidizing sulphur dioxide to form sulphur trioxide

C. dissolving sulphur trioxide in water to form oleum

D. mixing oleum with water to form concentrated sulphuric acid

27. 1998/II/32

Which of the following combinations in correct?

Sulphur dioxide bleach Chlorine bleach

A. The active ingredient is SO42+

(aq). The active ingredient is OCl- (aq).

B. It bleaches by oxidation. It bleaches by reduction.

C. Its bleaching action is faster. Its bleaching action is slower.

D. Its bleaching effect is temporary. Its bleaching effect is relatively long-lasting.

28. 1998/II/38

Which of the following experiments would produces sulphur dioxide?

(1) heating iron pyrites in air

(2) heating a mixture of iron and dilute sulphuric acid

(3) heating a mixture of copper and concentrated sulphuric acid


29. 1999/II/7

Substance X gives identical product (s) when treated with dilute sulphuric acid or concentrated sulphuric acid.

X may be

A. zinc B. cane sugar C. ammonia D. hydrated copper (II) sulphate crystals


109

30. 1999/II/24

In an experiment, sulphur dioxide is passed into an iodine solution which is prepared by dissolving some iodine in

potassium iodine solution. Which of the following statements concerning this experiment is correct?

A. The color of the iodine solution changes from purple to colorless

B. A brown solid is formed

C. A displacement reaction occurs

D. Sulphur dioxide is oxidized to sulphate ions

31. 2000/II/14

Which of the following solutions can react with bromine water to give a colourless solution?

A. sodium chloride solution B. sodium sulphite solution

C. sodium iodide solution D. sodium hypochlorite solution

32. 2000/II/31

Which of the following uses of sulphuric acid is/are correct?

(1) manufacture of soaps

(2) manufacture of paint additives

(3) manufacture of fertilizers


33. 2000/II/44

Which of the following statements concerning sulphur dioxide are correct?

(1) It can be prepared by heating copper turnings with concentrated sulphuric acid

(2) It is denser than air

(3) It can be absorbed by sodium hydroxide solution


34. 2000/II/45

1st statement 2

nd statement

Concentrated sulphuric acid can turn a piece of Concentrated sulphuric acid is a strong oxidizing agent.

filter paper black.

35. 2001/II/35

Which of the following statements concerning the reaction of iron(II) carbonate with 1 M sulphuric acid is/are

correct ?

(1) Sulphuric acid acts as an acid.

(2) Sulphuric acid acts as an oxidizing agent.

(3) Sulphuric acid acts as a dehydrating agent.



110

36. 2001/II/43

Which of the following are correct descriptions of the uses of sulphuric acid?

(1) treatment of metal surfaces in the electroplating industry

(2) manufacture of paint additives

(3) manufacture of fertilizers


37. 2001/II/47

1st statement 2

nd statement

Bromine water can be used to distinguish between Bromine can be reduced by sodium sulphite to

sodium sulphate solution and sodium sulphite solution. colourless bromide ions, but not by sodium sulphate.

38. 2002/II/30

Starch, a natural polymer, is a carbohydrate. When concentrated sulphuric acid is added dropwise to some

starch, a black substance is formed. The reaction involved is

A. dehydration. B. depolymerization. C. redox reaction. D. neutralization.

39. 2002/II/31

A part of the flow diagram for the Contact process is shown below :


X Y Z

A. air water concentrated sulphuric acid

B. air concentrated sulphuric acid oleum

C. oxygen sulphur trioxide concentrated sulphuric acid

D. oxygen water oleum

40. 2002/II/32

A black powder is suspected to be carbon or a mixture of carbon and copper(II) oxide.

Which of the following methods can be used to identify the black powder?

(1) adding dilute sulphuric acid to the powder

(2) adding sodium hydroxide solution to the powder

(3) heating the powder strongly



111

41. 2002/II/38

Which of the following set-ups can be used to dry moist sulphur dioxide gas?


42. 2002/II/41

When sulphur dioxide is bubbled into water, a colourless solution is formed. Which of the following statements

concerning the solution are correct?

(1) The solution conducts electricity better than water.

(2) The solution can change iron(III) sulphate solution from yellow to green.

(3) The solution can change potassium bromide solution from colourless to brown.


43. 2003/II/39

Which of the following statements concerning sulphur is/are correct?

(1) It is yellow in colour

(2) It dissolves in water to give an acidic solution

(3) It is used as a raw material in the Contact process


44. 2004/II/19

Which of the following conversions does NOT require a catalyst?

A. Fe2O3 (aq) → Fe(s) B. SO2 (g) → SO3 (g)

C. NH3 (g) → NO(g) D. CO(g) + NO(g) → CO2 (g) + N2 (g)

45. 2004/II/47

1st statement 2

nd statement

In the Contact process, oleum instead of water is The reaction of sulphur trioxide with water

used to absorb the sulphuric trioxide produced. is highly exothermic.

46. 2004/II/50

1st statement 2

nd statement

Sulphur dioxide is used to preserve dried fruits. Sulphur dioxide is toxic to micro organisms.


112

47. 2005/II/15

Question 47 and 48 refer to the following flow scheme for the production of sulphuric acid.

424 Stage

7223 Stage

32 Stage

2 1 Stage

SOHOSHSOSOZnS → → → →

Which of the following stages involves the largest change in oxidation number of sulphur?

A. Stage 1 B. Stage 2 C. Stage 3 D. Stage 4

48. 2005/II/16

Which of the following statements concerning the flow scheme is INCORRECT?

A. ZnS is roasted in air in Stage 1 B. Air is used as a reactant in Stage 2

C. Water is used to react with SO3 in Stage 3 D. Heat energy is liberated in Stage 4

49. 2005/II/17

Which of the following combinations correctly describes the difference between sulphur dioxide bleach and

chlorine bleach?

sulphur dioxide bleach chlorine bleach

A. bleaching by oxidation bleaching by reduction

B. faster bleaching action slower bleaching action

C. temporary bleaching effect permanent bleaching effect

D. suitable for bleaching cotton suitable for bleaching silk

50. 2006/II/20

The Contact Process involves the following reaction:

2 5

2 2 3

V O (s)2 SO (g) + O (g) 2 SO (g) H < 0∆��⇀

↽��

Which of the following statements can be correctly deduced from the above information?

A. The formation of sulphur trioxide is endothermic

B. The reaction should be carried out at high temperatures

C. Vanadium(V) oxide is one of the reactants

D. Sulphur trioxide will decompose into sulphur dioxide and oxygen


113

51. 2007/II/20

Questions 51 and 52 refer to the following experiment. When carbon and concentrated sulphuric acid are heated

together, sulphur dioxide and carbon dioxide are produced. These two gases are then passed through solution X

and solution Y as shown below :

Which of the following combinations of solution X and solution Y can be used to show that sulphur dioxide and

carbon dioxide are produced?

Solution X Solution Y

A. bromine water calcium hydroxide solution

B. iron(II) sulphate solution calcium hydroxide solution

C. acidified potassium dichromate solution sodium hydroxide solution

D. acidified potassium permanganate solution sodium hydroxide solution

52. 2007/II/21

Which of the following statements concerning the reaction between carbon and concentrated sulphuric acid are

correct?

(1) The oxidation number of carbon changes from 0 to +4.

(2) The oxidation number of hydrogen in sulphuric acid remains unchanged.

(3) Concentrated sulphuric acid acts both as a dehydrating agent and oxidizing agent.


53. 2007/II/25

Which of the following processes would produce sulphur dioxide?

(1) roasting iron pyrite in air

(2) heating zinc with concentrated sulphuric acid

(3) mixing dilute hydrochloric acid with sodium sulphite


54. 2008/II/11

In which of the following processes does sulphur dioxide act as a reducing agent?

A. passing sulphur dioxide into water

B. passing sulphur dioxide into iodine solution

C. passing sulphur dioxide into iron(II) sulphate solution

D. passing sulphur dioxide into sodium hydroxide solution


114

55. 2008/II/28

1st statement 2

nd statement

The bleaching action of sodium sulphate Sodium sulphite bleaches by oxidization

lasts longer then that of sodium hypochlorite. while sodium hypochlorite bleaches by reduction.

56. 2008/II/38

Which of the following statements concerning concentrated sulphuric acid is INCORRECT?

A. Concentrated sulphuric acid can be used as a drying agent for ammonia

B. Adding concentrated sulphuric acid to sugar will give a steamy fume

C. Blue litmus paper will finally turn black when dropped into concentrated sulphuric acid

D. When a beaker of concentrated sulphuric acid is left in air, the volume of liquid inside the beaker increase

gradually


115

1. 1990/II/8

Which of the following contains the largest number of ATOMS at room temperature and pressure?

(Relative atomic masses : H = 1.0, N = 14.0, Cl = 35.5;

Molar volume of gas at room temperature and pressure = 24dm3 )

A. 2 mol of ammonia gas B. 3 mol of nitrogen gas

C. 7 g of hydrogen gas D. 90 dm3 of hydrogen chloride gas

2. 1991/II/3

Solid X undergoes complete thermal dissociation according to the following equation:

X(s) → Y(g) + Z(s)

On heating 4.90 g of solid X, 1.40 dm3 of gas Y and 2.30 g of solid Z are obtained at room temperature

and pressure. What is the relative molecular mass of Y?

(Molar volume of gas at room temperature and pressure = 24.0 dm3 )

A. 32.0 B. 39.4 C. 44.6 D. 84.0

3. 1991/II/32

Which of the following gases contain the same number of molecules as 300 cm3 of oxygen under the same

temperature and pressure?

(1) 150cm3 of NH3 (2) 200cm

3 of O3 (3) 300cm

3 of He (4) 300cm

3 of HCl

A. (1) and (2) only B. (3) and (4) only C. (1),(3) and (4) only D. (2),(3) and (4) only

4. 1993/II/9

0.21g of a gaseous hydrocarbon occupies 0.12dm3 at room temperature and pressure. If this hydrocarbon

has the empirical formula CH2, what is its molecular formula?

(Relative atomic mass : H = 1.0, C = 12.0; Molar volume of gas at room temperature and pressure = 24.0dm3)

A. C2H4 B. C3H6 C. C4H8 D. C5H10

5. 1994/II/47

1st statement 2

nd statement

At room temperature and pressure, the molar The relative atomic mass of oxygen

volume of oxygen gas is greater than that of is greater than that of hydrogen.

hydrogen gas.

6. 1995/II/31

Refer to the following chemical equation: Fe2O3(g) + 3CO(g) → 2Fe(s) + 3CO2(g)

What volume of carbon dioxide, measured at room temperature and pressure, is produced if 224 g of iron are

formed? (Relative atomic masses : Fe = 56.0; Molar volume of gas at room temperature and pressure = 24 dm3 )

A. 16 dm3 B. 36 dm

3 C. 72 dm

3 D. 144 dm

3

HKCEE CHEMISTRY | 6.3 Molar volume of gases | P.1

116

7. 1996/II/11

In an experiment, 1.6 g of sulphur are burnt completely in air to form sulphur dioxide. What volume of sulphur

dioxide, measured at room temperature and pressure, is formed?

(Relative atomic mass : S = 32.0; Molar volume of gas at room temperature and pressure = 24.0 dm3)

A. 0.6 dm3 B. 1.2 dm

3 C. 2.4 dm

3 D. 12.0 dm

3

8. 1996/II/19

Under certain conditions, 60 cm³ of a gaseous compound, NxOy, decompose completely to give 60 cm3 of

nitrogen gas and 30 cm³ of oxygen gas. (All gas volumes are measured at the same temperature and pressure.)


x y

A. 1 1

B. 1 2

C. 2 1

D. 2 3

9. 1996/II/32

Which of the following statements concerning one mole of nitrogen gas is/are correct?

(1) It has a mass of 14.0 g

(2) It occupies the same volume as 4.0 g of helium gas at room temperature and pressure

(3) It contains 6.02 × 1023

atoms of nitrogen

(Relative atomic masses : He = 4.0, N = 14.0; Avogadro constant = 6.02 × 1023

mol-1

)


10. 1999/II/16

At room temperature and pressure, 8.0 g of oxygen and 20.0 g of gas X occupy the same volume.

What is the molar mass of X?

(Relative atomic mass : O = 16.0; molar volume of gas at room temperature and pressure = 24.0 dm3)

A. 20.0 g. B. 40.0 g. C. 60.0 g. D. 80.0 g.

11. 2000/II/23

In an experiment, 21.8 g of zinc was treated with 250.0 cm3

of 2.0 M hydrochloric acid.

What volume of hydrogen was liberated at room temperature and pressure?

(Relative atomic mass : Zn = 65.4; molar volume of gas at room temperature and pressure = 24.0 dm 3 )

A. 4.0 dm3 B. 6.0 dm

3 C. 8.0 dm

3 D. 12.0 dm

3


117

12. 2000/II/48

1st statement 2

nd statement

The volume of 10.0 g of gaseous carbon dioxide 10.0 g of gaseous carbon dioxide contain the same

is the same as the volume of 10.0 g of solid carbon number of molecules as 10.0 g of solid carbon dioxide.

dioxide.

13. 2001/II/10

Consider the reaction : 4H2(g) + Fe3O4(s) → 3Fe(s) + 4H2O(l)

What mass of iron would be obtained if 96.0 cm³ of hydrogen, measured at room temperature and pressure,

is consumed in the reaction ?

(Relative atomic mass : Fe = 56.0; molar volume of gas at room temperature and pressure = 24 dm3 )

A. 0.056 g B. 0.084 g C. 0.168 g D. 0.224 g

14. 2001/II/27

Suppose that the Avogadro number is L. How many atoms does 600 cm3 of oxygen at room temperature and

pressure contain? (Molar volume of gas at room temperature and pressure = 24 dm3 )

A. 401 L B.

201 L C. 25 L D. 50 L

15. 2002/II/16

Gases X and Y react to give a gaseous product Z. The reaction can be represented by the equation :

X (g) + 3Y (g) → 2Z(g)

In an experiment, 40 cm3 of X and 60 cm

3 of Y are mixed and are allowed to react in a closed vessel.

What is the volume of the resultant gaseous mixture?

(All volumes are measured at room temperature and pressure.)

A. 40 cm3 B. 60 cm

3 C. 80 cm

3 D. 100 cm

3

16. 2003/II/6

Sodium azide, NaN3, is used in air bages in cars. When there is a serious collision, the azide will decompose

to give nitrogen. The decomposition can be represented by the equation:

2NaN3 (s) → 2Na(s) + 3N2 (g)

What is the mass of sodium azide required to produce 72dm3 of nitrogen at room temperature and pressure?

(Relative atomic masses : N = 14.0, Na = 23.0; Molar volume of gas at room temperature and pressure = 24dm3)

A. 65.0g B. 130.0g C. 195.0g D. 292.5g


118

17. 2004/II/3

The relative atomic masses of hydrogen and oxygen are 1.0 and 16.0 respectively. Which of the following

statements concerning 36.0 g of water is correct?

(Molar volume of gas at room temperature and pressure = 24dm3 ; Avogadro constant = 6.02 × 10

23mol 1− )

A. It contains 4 mol of hydrogen atoms

B. It contains 3 × 6.02 x 1023

atoms

C. It contains 6 × 6.02 x 1023

molecules

D. It has a volume of 48 dm3 at room temperature and pressure

18. 2004/II/6

Decomposition of KClO3 (s) at elevated temperature gives KCl(s) and O2 (g) as the only products.

What is the volume of O2 (g) produced, measured at room temperature and pressure, when 61.3 g of KClO3 (s)

undergoes complete decomposition? (Relative atomic masses : O = 16.0, Cl = 35.5, K = 39.1; molar volume

of gas at room temperature and pressure = 24dm3)

A. 8 dm3 B. 12 dm

3 C. 18 dm

3 D. 36 dm

3

19. 2005/II/35

NaHCO3 decomposes upon eating to form Na2CO3,CO2 and H2O. What is the volume of CO2 formed

at room temperature and pressure if 336 g of NaHCO3 undergoes complete decomposition?

(Relative atomic masses : H = 1.0, C = 12.0, O = 16.0, Na = 23.0; Molar volume of gas at room temperature and

pressure = 24 dm3 )

A. 12dm3 B. 24 dm

3 C. 48 dm

3 D. 96 dm

3

20. 2006/II/41

Metal X forms an oxide with the formula X2O. Upon strong heating, the oxide undergoes decomposition

according to the following equation: 2X2O(s) → 4X(s) + O2 (g)

Complete decomposition of 2.90g of the oxide gives 150 cm3 of oxygen, measured at room temperature and

pressure. What is the relative atomic mass of X?

A. 54.0 B. 108.0 C 216.0 D. 232.0

21. 2006/II/50

1st statement 2

nd statement

Under room temperature and pressure, 1 mol of O2 (g) The number of atoms in 1 mol of O2 (g)

occupies a smaller volume than 1 mol of O3 (g). is less than that in 1 mol of O3(g)

22. 2007/II/33

50cm3 of carbon monoxide burns completely in 50 cm

3 of oxygen. Assuming that all volumes are measured

at room temperature and pressure, what is the final gaseous volume at the end of the combustion?

A. 50cm³ B. 75 cm³ C. 100 cm³ D. 150 cm³


119

23. 2007/II/39

CO2 (g), SO3 (g) and O2 (g) are composed of atoms of different elements. At room temperature and pressure,

what is the ratio of the number of atoms involved in 100cm3 of CO2 (g), 100cm

3 of SO3 (g) and 200cm

3

of O2 (g)?

A. 3 : 4 : 4 B. 3 : 4 : 2 C. 2 : 3 : 4 D. 1 : 1 : 2

24. 2007/II/40

When 10 g of PURE calcium carbonate (molar mass = 100.1 g) reacted with excess hydrochloric acid, 2.40 dm3

of carbon dioxide was obtained at room temperature and pressure. However, in a similar experiment using 10 g

of IMPURE calcium carbonate, 2.50 dm3 of carbon dioxide was obtained. Assumuming that the impurity is a

metallic carbonate, what would this impurity be? ( Molar masses : MgCO3 = 84.3 g, ZnCO3 = 125.4 g,

FeCO3 = 115.8 g, CuCO3 = 123.5 g)

A. MgCO3 B. ZnCO3 C. FeCO3 D. CuCO3

25. 2008/II/32

Nitroglycerin (C3H5N3O9) is an explosive and can explode according to the following equation:

4C3H5N3O9 (l) → 12CO (g) + 10H2O(g) + 6N2 (g) + O2 (g)

0.1 mole of nitroglycerin undergoes explosion and the products are allowed to cool to room temperature.

What is the total volume of gases left behind at room temperature and pressure?

A. 11.4 dm3 B. 17.4 dm

3 C. 45.6 dm

3 D. 69.6 dm

3


120

1. 1993/II/33

Which of the following statements about fossil fuels is correct?

A. They are liquids or gases

B. They are all formed from plants which died millions of years ago

C. They can be recycled to help conserve energy resources

D. They cause air pollution when burnt

2. 1994/II/22

Q. 2 and 3 refer to the following diagram which shows a fractional column of an oil refinery.

Which of the following fractions is NOT cracked to produce more useful products?

A. P B. Q C. R D. S

3. 1994/II/23


A. Fraction P has the highest boiling point

B. Fraction T is used to surfacing roads

C. Fraction U is the least viscous

D. Fraction S burns with a more sooty flame than fraction Q

4. 1996/II/13

Which of the following substances is NOT derived from petroleum?

A. bleach B. ethanol C. polystyrene D. soapless detergent

5. 2002/II/11

Which of the following petroleum fractions has a supply that outweighs the demand in modern society?

A. fuel gases B. kerosene C. petrol D. heavy oil

HKCEE CHEMISTRY | 7.1 Fossil fuels | P.1

121

6. 2005/II/43

Consider the reaction represented by the equation below:

C(s) + H2O(g) ��⇀↽�� CO(g) + H2 (g)

Which of the following statements concerning this reaction are correct?

(1) It is a reversible reaction

(2) The raw materials for the reactants are readily available in nature

(3) The product mixture formed can be used as a gaseous fuel


7. 2008/II/14

Which of the following petroleum fractions has the highest carbon content?

A. diesel B. petrol C. kerosene D. naphtha

8. 2008/II/27

Which of the following substances are sources of organic chemicals?

(1) wood

(2) rock

(3) crude oil


HKCEE CHEMISTRY | 7.1 Fossil fuels | P.2

122

1. 1991/II/24

The IUPAC name for is

A. 3-dibromobut-1-ene B. 2-dibromobut-4-ene

C. 3,3-dibromobut-1-ene D. 2,2-dibromobut-4-ene

2. 1991/II/25

Which of the following statements about structural isomers is correct?

A. They have the same molecular formula but different empirical formulae

B. They have the same molecular formula but different structural formulae

C. They have the same empirical formula but different molecular formulae

D. They have the same empirical formula but different structural formulae

3. 1994/II/40

Compounds X and Y have the following structures:

H C

H

H

C

H

H

C

H

H

C

H

HH

H C

H

H

C

C

H

C

H

H

H

H

H

H

X Y

Which of the following statements about compounds X and Y are correct?

(1) They have the same boiling point

(2) They belong to the same homologous series

(3) They are isomers


4. 1995/II/43

Which of the following are characteristics of a homologous series?

(1) Members of the series can be represented by the same general formula

(2) Members of the series have same physical properties

(3) Members of the series have similar chemical properties


5. 1997/II/16

Which of the following compounds represents the first member of a homologous series?

A. ethane B. ethene C. ethanol D. ethanoic acid

HKCEE CHEMISTRY | 7.2 Homologous series, structural formulae and carbon compounds | P.1

123

6. 2000/II/8

Which of the following statements concerning members of a homologous series is INCORRECT?

A. They contain carbon and hydrogen only

B. They can be represented by the same general formula

C. They have similar chemical properties

D. Their boiling points increase with their relative molecular masses

7. 2003/II/8


Homologous series General formula Homologous series General formula

A. alkenes Cn

Hn2 B. alkenes C

nH 22 +n

C. alkanol Cn

Hn2 OH D. alkanoic acids C

nH 12 +n CO 2 H

8. 2004/II/42

The structures of two organic compounds are shown below:

Which of the following statements concerning the two compounds are correct?

(1) Both compounds are members of the same homologous series

(2) Both compounds have the same molar volume at room temperature and pressure

(3) Both compounds undergo substitution when treated with bromine


9. 2005/II/1

What is the systematic name of the following hydrocarbon?

A. 1,1,2-trimethylpropane B. 2,3,3-trimethylpropane

C. 1,2-dimethylbutane D. 2,3-dimethylbutane

10. 2007/II/4

Which of the following statements concerning members of a homologous series is correct?

A. The members have the same molecular formula

B. The relative molecular mass of each successive member differs by 14

C. The volatility of the members increases with relative molecular mass

D. The members with more carbon atoms in their molecules burn more readily


124

11. 2007/II/8

What is the systematic name of the following compound?

CH3

C

C2H

5

Cl

CH3

A. 2-chloro-2-ethylpropane

B. 2-chloro-2-methylbutane

C. 1-chloro-1,1-dimethylpropane

D. 2-chloro-2,2-dimethylpropane

12. 2007/II/30

1st statement 2

nd statement

Carbon can form a large number of compounds Carbon atoms can share electrons with one another.

with long carbon chains.


125

1. 1990/II/6

The boiling points of some hydrocarbons are given in the table below:

Hydrocarbon Ethane Ethene Propene

Boiling point (°C) –89 –104 –48

If a mixture of these three hydrocarbons at –110°C is allowed to warm gradually to –80°C, which of the

following will happen?

A. Ethene will remain in the liquid state

B. Propene will remain in the liquid state

C. Ethane and ethene will remain in the liquid state

D. Ethane, ethene and propene will exist in the gaseous state

2. 1990/II/36

Which of the following tests can be used to distinguish between ethane and ethene?

(1) burning the gas in air

(2) bubbling the gas through bromine in tetrachloromethane

(3) bubbling the gas through acidified potassium permanganate solution


3. 1991/II/5

Tetrachloromethane is a common solvent in the chemical laboratory. Which of the following hazard warning

labels should be displayed on the bottle of tetrachloromethane?


4. 1991/II/22

Propene reacts with acidified potassium permanganate solution to form

A. CH3CH2CH2OH B. CH3CH(OH)CH3

C. CH3CH(OH)CH2OH D. CH2OHCH(OH)CH2OH

5. 1992/II/21

When 2-methylpropene reacts with bromine in tetrachloromethane, the product is

HKCEE CHEMISTRY | 7.3 Alkanes & alkenes | P.1

126

6. 1992/II/24

Which of the following statements concerning CH3CH3, CH3CH2CH3 and CH3CH(CH3) CH3 is correct?

A. They have different boiling points.

B. They belong to different homologous series.

C. They burn in excess oxygen to form carbon monoxide and water.

D. They readily decolorize bromine is totrachloromethane.

7. 1994/II/41

A compound has the following structures:

CC

H

CH3CH

2 H

H

Which of the following statements about this compound are correct?

(1) It can decolorize bromine water

(2) It can be polymerized

(3) It can burn in air


8. 1994/II/45

1st statement 2

nd statement

Butane can immediately decolorize a solution Butane can be oxided by bromine.

of bromine in tetrachloromethane.

9. 1995/II/20

Which of the following statements concerning alkenes is INCORRECT?

A. They can decolorize a solution of bromine in 1, 1, 1-trichloroethane

B. They can decolorize red litmus solution

C. They can decolorize acidified potassium permanganate solution

D. They can be polymerized to form addition polymers

10. 1995/II/29

Which of the following compounds have the same empirical formula?

(1) ethene (2) ethane (3) propene (4) propane

A. (1) and (2) only B. (1) and (3) only C. (2) and (4) only D. (3) and (4) only

11. 1995/II/42

Which of the following products may be formed from the cracking of heavy oil fraction?

(1) CO (2) C2H4 (3) C8H18



127

12. 1996/II/14

One mole of each of the following compounds is burnt completely in oxygen. Which compound requires the

greatest volume of oxygen, measured at the same temperature and pressure, for complete combustion?

A. carbon monoxide B. ethane C. ethene D. ethanol

13. 1997/II/18

The model shown below represents a compound containing 6 hydrogen atoms (white spheres )

and 3 carbon atoms (black spheres)

Which of the following statements concerning the compound is INCORRECT?

A. Its structural formula is C3H6

B. It can be prepared by cracking petroleum fractions

C. It can decolorize bromine in 1, 1, 1-trichloroethane

D. It can undergo polymerization

14. 1997/II/23

Q.14 and Q.15 refer to the following experiment :

Which of the following set-ups should be connected to the delivery tube to collect the gaseous products formed?

15. 1997/II/24

Which of the following reactions is involved in this experiment?

A. cracking B. redox C. catalytic hydration D. destructive distillation


128

16. 1997/II/33

Which of the following statements concerning the reaction of methane with bromine is/are correct?

(1) It is an addition reaction

(2) It is a substitution reaction

(3) A similar reaction will occur if propane is used instead of methane


17. 1998/II/14

Which of the following statements concerning propene is correct?

A. It can be converted by catalytic hydration to an alkanol with molecular.

B. It can undergo condensation polymerization.

C. It can be manufactured by fractional distillation of crude oil.

D. It can undergo substitution reaction with a solution of bromine in 1, 1, 1-trichloroethane.

18. 1998/II/17

Which of the following statements concerning the compounds C2H4, C3H6, and C4H10 is correct?

A. They belong to the same homologous series

B. They are unsaturated hydrocarbon

C. They are gases at room temperature and pressure

D. They have the same physical properties

19. 1998/II/24

Consider the following manufacturing process:

cracking polymerizationnaphtha compound X Product Y→ →

Which of the following graphs (not drawn to scale) can represent the change in relative molecular masses of the

substances involved during the manufacturing process?

20. 1999/II/32

Which of the following substances can react with acidified potassium permanganate solution?

(1) ethene (2) copper (II) sulphate solution (3) iron (II) sulphate solution



129

21. 1999/II/44

Which of the following statements concerning the reaction of an alkane with bromine are correct?

(1) The reaction occurs faster under sunlight than in darkness

(2) The reaction is a substitution

(3) The colour of the reaction mixture fades


22. 2000/II/6

Which of the following pairs of compounds can be distinguished by treating with an acidified potassium

dichromate solution ?

A. ethane and ethene B. ethanol and propan-1-ol

C. sodium carbonate and sodium hydrogencarbonate D. sodium sulphite and sodium sulphate

23. 2000/II/25

Which of the following processes is endothermic?

A. cracking of petroleum fractions

B. fermentation of glucose solution

C. manufacture of ammonia by the Haber process (Out of Syll.)

D. oxidation of sulphur dioxide to sulphur trioxide in the contact process

24. 2001/II/32

The formulae of three straight-chain hydrocarbons are listed below:

(1) C2H6 (2) C3H6 (3) C4H8

Which of these hydrocarbons is/are unsaturated?


25. 2002/II/9

Which of the following equations represents a cracking reaction?

A. C4H8 + H2 → C4H10 B. C4H10 → C3H6 + CH4

C. C6H12O6 → 2C2H5OH + 2CO2 D. C4H9OH → C4H8 + H2O

26. 2002/II/33

Which of the following reactions is/are endothermic?

(1) the fermentation of glucose

(2) the cracking of naphtha

(3) the reaction of lime with dilute hydrochloric acid



130

27. 2002/II/34

Upon complete combustion, gaseous hydrocarbon X gives an equal number

of moles of carbon dioxide and water. Which of the following hydrocarbons may X be?

(1) ethane (2) ethene (3) propene


28. 2002/II/44

Both ethene and ethyne are gaseous hydrocarbons. Their structures are shown below:

Which of the following statements concerning ethene and ethyne are correct?

(1) Both are unsaturated hydrocarbons

(2) Both are insoluble in water

(3) Ethyne burns with a more sooty flame than ethene


29. 2003/II/31

Propene is an unsatured hydrocarbon. Which of the following reactions is/are characteristic of the unsatured

nature of propene?

(1) It undergoes incomplete combustion to give carbon monoxide

(2) It decolorizes acidified potassium permanganate solution

(3) It undergoes polymerization to give polypropene


30. 2003/II/33

Ethane reacts with bromine under suitable conditions. Which of the following statements concerning this reaction

is/are correct?

(1) The reaction occurs readily in the dark

(2) The reaction is a substitution

(3) The reaction gives a mixture of organic products


31. 2004/II/21

A gaseous mixture consists of methane and ethane in a mole ratio of 1 : 1. It has a volume of 200cm3 at room

temperature and pressure. What is the volume of oxygen required, measured at room temperature and pressure,

for the complete combustion of the mixture?

A. 400cm3 B. 550 cm

3 C. 700 cm

3 D. 1100 cm

3


131

32. 2004/II/45

1st statement 2

nd statement

Both but-1-ene and but-2-ene can decolorize Both but-1-ene and but-2-ene have the same

a solution of bromine in 1,1,1-trichloromethane. molecular formula

33. 2005/II/2

Upon cracking, one molecule of decane(C10H22) gives two molecules of propene and one molecule of

an alkane (X). What is X?

A. C4H6 B. C4H10 C. C7H14 D. C7H16

34. 2005/II/4

What is the type of reaction involved when hydrogen bromide reacts with ethene to form bromoethane?

A. addition B. cracking C. polymerization D. substitution

35. 2005/II/12

Which of the following reactions is endothermic?

A. Zn(s) + Cu2+

(aq) � Zn2+

(aq) + Cu(s)

B. CaCO3(s) + 2H+(aq) � Ca

2+(aq) + H2O(l) + CO2(g)

C. 2C4H10(g) + 13O2(g) � 8CO2(g) + 10H2O(l)

D. C9H20(l) � C2H6(g) + C3H6(g) + C4H8(g)

36. 2006/II/12

Consider the following information:

Compound Relative molecular mass

CH3CH2OH 46

CH3CH2OCH3 80

CH3CH2CO2CH3 88

C6H12O6 180

When 1 g of each these compounds undergoes complete combustion, which one will produce the greatest

number of moles of carbon dioxide?

A. CH3CH2OH B. CH3CH2OCH3 C. CH3CH2CO2CH3 D. C6H12O6

37. 2006/II/16

Which of the following compounds is formed from the reaction of propene with chlorine?

A. B. C. D.


132

38. 2007/II/27

Which of the following statements concerning but-2-ene are correct?

(1) It has the same molecular formula as but-1-ene

(2) It can form a polymer with as the repeating unit.

(3) It can decolorize acidified potassium permanganate solution


39. 2007/II/49

1st statement 2

nd statement

Cracking is an endothermic reaction. Cracking results in an increase of number of molecules.

40. 2008/II/13

Which of the following statements concerning the reaction between acidified potassium permanganate

solution and excess propene is INCORRECT?

A. The oxidation number of manganese changes from +7 to +2

B. The reaction occurred is an addition reaction

C. The acidified potassium permanganate solution is decolorized

D. The structure of the organic product is CH2 (OH)CH2CH2OH

41. 2008/II/24

When chlorine reacts with methane under sunlight, which of the following compounds can be formed?

(1) chloromethane

(2) dichloromethane

(3) hydrogen chloride


42. 2008/II/29

1st statement 2

nd statement

The boiling point of butane is higher than that of The van der Waals’ forces between butane molecules

methane. are stronger than the forces between methane

molecules.


133

1. 1990/II/18

Which of the following statements concerning acid rain is NOT correct?

A. Acid rain can be caused by the burning of fossil fuel.

B. Acid rain can corrode buildings.

C. Acid rain can make the soil infertile by removing minerals from the soil.

D. Acid rain can attack the human respiratory system.

2. 1991/II/34

The rain-water samples collected in Tsuen Wan District are found to be more acidic than those collected in

Central District. Which of the following air pollutants would be responsible for this phenomenon?

(1) carbon monoxide

(2) sulphur dioxide

(3) nitrogen dioxide


3. 1992/II/44

Which of the following pollutants are found in the exhaust form cars using petrol as fuel?

(1) CO

(2) SO2

(3) NO2


4. 1993/II/48

1st statement 2

nd statement

When car exhaust gases are bubbled into Nitrogen dioxide is present in car exhaust gases.

citrated blood, the colour of the blood gradually

becomes cherry red.

5. 1995/II/23

Which of the following substances can cause acid rain?

A. lead compounds from the burning of leaded petrol in motor cars

B. carbon dioxide from the complete combustion of town gas

C. carbon soots from the incomplete combustion of coal

D. nitrogen dioxide from the burning of fuels in power stations

6. 1995/II/48

1st statement 2

nd statement

Huge quantities of carbon dioxide produced by the Carbon dioxide can trap the solar energy which is

burning of fossil fuels cause the greenhouse effect. re-radiated from the earth’s surface to the atmosphere.

HKCEE CHEMISTRY | 7.4 Consequences of using fossil fuels | P.1

134

7. 1996/II/20

Which of the following methods can be used to minimize the air pollutant mentioned?

A. increase the air supply to remove nitrogen dioxide produced by burning heavy oil

B. using catalytic converters to remove lead compounds produced by burning leaded petrol

C. using scrubbers remove carbon monoxide produced by the incomplete combustion of diesel

D. using electrostatic precipitators to remove particulates produced by burning coal

8. 1996/II/48

1st statement 2

nd statement

The cost of town gas goes up when the cost of crude oil rises. Town gas is manufactured from naphtha.

9. 1997/II/42

Which of the following measures can reduce the formation of acid rain?

(1) installing catalytic oxidizers in cars

(2) using unleaded petrol in cars

(3) using fuels of low sulphur content cars


10. 1998/II/3

Which of the following substance is the main constituent of town gas?

A. hydrogen B. methane C. carbon monoxide D. gaseous naphtha

11. 1998/II/7

Which of the following environmental problems is NOT caused by excessive burning of fossil fuels?

A. the corrosion of marble statues B. the formation of smog

C. a higher incidence of liver diseases D. global warming

12. 1998/II/39

The diagram below shows a catalytic converter fitted to the exhaust system of a car.

Which of the following pollutants from the car engine undergo reactions in the catalytic converter to produce less

harmful products?

(1) carbon monoxide

(2) hydrocarbons

(3) nitrogen monoxide



135

13. 1998/II/47

1st statement 2

nd statement

The use of leaded petrol has been banned in Hong Kong. Lead compounds in car exhaust can cause damage

(*Remark : Leaded petrol is banned since 1999, to human brains.

so, this item is correct in 1998.)

14. 1999/II/30


Pollutant Harmful effect Pollutant Harmful effect

A. Hydrocarbons Causing liver diseases B. Carbon monoxide Causing unconsciousness

C. Lead compounds Causing brain damage D. Carbon particles Causing respiratory diseases

15. 2000/II/27

Which of the following changes occurs in a catalytic converter installed in a motor car?

A. Nitrogen monoxide changes to nitrogen dioxide B. Carbon monoxide changes to carbon dioxide

C. Unburnt hydrocarbons change to carbon particles D. Sulphur changes to sulphur dioxide

16. 2000/II/40

Which of the following measures can reduce the emission of pollutants from a coal-fired power station?

(1) installation of scrubbers

(2) installation of electrostatic precipitators

(3) increasing the height of the chimney


17. 2001/II/3

Which of the following processed is exothermic?

A. melting of ice B. evaporation of ethanol

C. sublimation of iodine D. dissolving of sodium hydroxide pellets in water

18. 2001/II/14

Which of the following pairs is correctly matched?

Pollutant Effect

A. carbon monoxide global warming

B. sulphur dioxide darkening of building walls

C. lead compounds liver disease

D. unburnt hydrocarbons lung cancer


136

19. 2001/II/31

Which of the following measures can reduce the emission of sulphur dioxide from a factory using diesel fuel?

(1) the installation of catalytic converters

(2) the installation of scrubbers

(3) the installation of electrostatic precipitators


20. 2001/II/41

Which of the following statements concerning oil spillage on the sea are correct?

(1) Petroleum is toxic to marine lives.

(2) Petroleum can block the oxygen supply to marine lives.

(3) Petroleum can cause the outbreak of fire on the sea.


21. 2002/II/40

Which of the following gases can cause global warming?

(1) methane

(2) carbon dioxide

(3) chlorofluorocarbons


22. 2003/II/37

Which of the following statements concerning the manufacture of town gas in Hong Kong is/are correct?

(1) Town gas is produced from coal

(2) Town gas contains hydrogen as the major component

(3) Oxygen is added to enhance the flammability of town gas prior to its delivery to consumers


23. 2004/II/37

After heavy rain, the Air Pollution Index becomes lower. Which of the following air pollutants are likely to

have been removed by the rain water?

(1) particulates

(2) carbon monoxide




137

24. 2005/II/45

Questions 24 to 26 refer to the following information.

Obtaining energy from the sun provides many advantages over that from combustion of fossil fuels.

The diagram below shows a closed system which can be used to convert solar energy to heat energy

by means of two chemical reactions.

The gases in the diagram are circulated around the system. Energy is stored by means of Reaction I

and later released by means of Reaction II.

What are the advantages of obtaining energy from the sun over that from combustion of fossil fuels?

(1) Supply of solar energy is unlimited.

(2) Solar energy is always available.

(3) Using solar energy produces no waste products.


25. 2005/II/46

Which of the following energy conversions is involved in the system?

A. chemical energy → heat energy

B. light energy → heat energy

C. chemical energy → light energy → heat energy

D. light energy → chemical energy → heat energy

26. 2005/II/47

Which of the following statements concerning the system are correct?

(1) Reaction I is endothermic.

(2) SO2(g) and O2(g) should be pumped into Reaction Tank II from time to time.

(3) A catalyst is required in Reaction Tank II.



138

27. 2006/II/22

Which of the following processes is/are application(s) of neutralization?

(1) using scrubbers to remove sulphur dioxide from flue gas in a power station

(2) using catalytic converts to remove nitrogen oxides in car exhaust

(3) using sodium hydroxide solution to remove copper(II) ions in industrial waste water


28. 2006/II/23

Rain water samples colleted in industrial areas have pH lower than those collected in the countryside.

Which of the following air pollutants is/are responsible for this phenomenon?

(1) carbon monoxide


(3) particulates


29. 2006/II/30

1st statement 2

nd statement

In Hong Kong, taxis have switched from using Burning natural gas poses less harm to the environment

diesel to using natural gas as fuel. than burring diesel.

30. 2007/II/26

Which of the following statements concerning the measures to reduce air pollutants is/are correct?

(1) Scrubber can be used to reduce carbon monoxide

(2) Catalytic converter can be used to reduce nitrogen monoxide

(3) Electrostatic precipitator can be used to reduce unburnt hydrocarbons


31. 2008/II/1

Which of the following statements concerning acid rain is INCORRECT?

A. Acid rain refers to rain with pH less than 5.6

B. Acid rain corrode iron window frames and marble buildings

C. One major air pollutants that causes the formation of acid rain is carbon dioxide

D. Acid rain will be formed when the gases discharged by power stations using fossil fuels enter

the atmosphere


139

1. 1990/II/34

What is the total number of isomer for an alkanol having the chemical formula C4H9OH?

A. 2 B. 3 C. 4 D. 5

2. 1990/II/39

A glass of sweet wine is left on a dining table. After two days, the wine becomes sour. Which of the following

type of reactions accounts for this change?

A. oxidation B. hydrolysis C. fermentation D. esterification

3. 1991/II/30

Propan-1-ol is refluxed with acidified potassium permanganate solution for a long time. Which of the following

descriptions is/are correct?

(1) The reactants undergo esterification

(2) Propanoic acid is formed

(3) The permanganate is reduced


4. 1992/II/20

Which of the following compounds does not react with propan-1-ol?

A. sodium (Out of syll.) B. bromine water

C. acidified potassium permanganate solution D. ethanoic acid

5. 1992/II/41

A compound, C2H4O2, reacts with ethanol in the presence of concentrated sulphuric acid to form a product with a

fruity smell. Which of the following statements about this compound is/are correct?

(1) It can liberate carbon dioxide from sodium carbonate solution

(2) It can decolorize acidified potassium permanganate solution

(3) Its aqueous solution is an electrolyte


HKCEE CHEMISTRY | 7.5 Alkanol, alkanoic acid and ester | P.1

140

6. 1993/II/30


A mixture of methyl propanoate and sulphuric acid was allowed to react by heating under reflux for some time

until equilibrium was reached. The resulting mixture M was then transferred to flask Y and heated as shown

below:

What is the function of the piece of apparatus labeled X?

A. to condense the products in M

B. to separate the products in M

C. to prevent the loss of the products in M due to evaporation

D. to prevent the loss of the reactants in M due to evaporation

7. 1993/II/31

The first fraction of the distillate collected in flask Z is mainly

A. methanol B. propan-1-ol C. methanoic acid D. propanoic acid

8. 1994/II/19

Which of the following substances can turn a acidified solution of potassium permanganate colourless?

A. ethane B. ethanol C. ethanoic acid D. ethyl ethanote

9. 1994/II/42

Which of the following substances can be fermented to give an alcoholic drink?

(1) grapes (2) wheat (3) potatoes



141

10. 1995/II/15

The structural formula of a certain compound is shown below.

H C

H

H

C

H

C

H

C

OH

H

HH H

The name of this compound is

A. butan-1-ol B. butan-2-ol C. 2-methylpropan-1-ol D. 2-methylpropan-2-ol

11. 1995/II/21

Which of the following diseases is NOT associated with the excessive drinking of alcohol?

A. stomach ulcer. B. brain damage. C. sore throat. D. liver damage

12. 1996/II/22

Which of the following statements concerning the manufacture of ethanol by fermentation is INCORRECT?

A. Wheat can be used as a raw material.

B. Yeast is required in the fermentation process.

C. Carbon dioxide is liberation in the fermentation process.

D. The ethanol produced can be completely extracted by simple distillation.

13. 1996/II/23

Q.13 and Q.14 refer to the following experiment.

A reaction mixture containing acidified potassium dichromate solution and ethanol is heated using the set-up

shown below.

In this experiment, the reaction mixture is undergoing.

A. reflex B. distillation C. emulsification D. fractional distillation


142

14. 1996/II/24

Which of the following statements concerning this experiment is correct?

A. The acidified potassium dichromate solution acts as a catalyst

B. The reaction mixture gradually becomes brown

C. Ethanol is reduced during the experiment

D. Ethanol acid is formed during the experiment

15. 1996/II/40

Which of the following substances, if taken in excess, would affect the correct judgment of a car driver?

(1) ethanol (2) codeine (Out of syll.) (3) morphine (Out of syll.)


16. 1996/II/41

Which of the following statements concerning propan-1-ol are correct?

(1) propan-1-ol can be used as a solvent

(2) propan-1-ol can undergo polymerization

(3) propan-1-ol can undergo esterification with ethanoic acid in the presence of concentrated sulphuric acid


17. 1997/II/19

Which of the following compounds CANNOT be produced directly from ethene?

A. carbon dioxide B. ethanol C. ethyl ethanoate D. 1, 2-dibromoethane

18. 1997/II/20

When a glass of wine is left overnight, it becomes sour. Which of the following reactions is responsible for this

change?

A. fermentation B. oxidation C. dehydration D. esterification

19. 1997/II/22

Which of the following statements concerning the compound, CH3COOCH2CH3, is correct?

A. It is a food preservative B. It has a pleasant smell

C. Its systematic name is methyl ethanoate D. It is an electrolyte

20. 1997/II/38

Which of the following statements about using ethanol as a car fuel is correct?

(1) Ethanol is a cleaner fuel than petrol

(2) Using ethanol as a car fuel is economical in agricultural countries with sugar cane as the main crop

(3) A car engine has to be suitably modified when using ethanol as a fuel



143

21. 1998/II/29

X is a compound containing four carbon atoms. It gives negative results with the following tests.

Test

(1) Treating X with sodium hydrogencarbonate solution.

(2) Treating X with a solution of bromine in 1, 1, 1-trichloroethane.

(3) Heating X with acidified potassium dichromate solution.

The structure formula of X may be.

A. CH3CH2CH=CH2. B. CH3CH2CH2CH2OH. C. CH3CH2CH2CO2H. D. CH3CH2CH2CH3.

22. 1998/II/48

1st statement 2

nd statement

The ethanol content of beer is less than that of red wine. Beer is made by fermentation of barely while

red wine is made by fermentation of grapes.

23. 1999/II/3

Which of the following substances has the lowest boiling point?

A. ethanol B. propan-1-o1 C. propane D. butane

24. 1999/II/26


Some concentrated sulphuric acid and pumice stones were added to an alkanol and an alkanoic acid. The mixture

was heated under reflex for some time and the following compound was obtained:


Alkanol Alkanol acid

A. Methanol Ethanoic acid

B. Methanol Propanoic acid

C. Ethanol Ethanoic acid

D. Ethanol Propanoic acid

25. 1999/II/27

Which of the following statements concerning the experiment is correct?

A. Concentrated sulphuric acid acts as an oxidizing agent in the reaction

B. The purpose of using pumice stones is to speed up the reaction

C. A fractionation column should be used in the experimental set-up

D. Heating under reflux can prevent the loss of reactants and products


144

26. 1999/II/35

The label below is displayed on a container for chemical X:

Which of the following chemicals may X be?

(1) bromochlorodifluoromethane (Out of syll.) (2) ethanol (3) potassium


27. 2000/II/6

Which of the following pairs of compounds can be distinguished by treating with an acidified potassium

dichromate solution?

A. ethane and ethene B. ethanol and propan-1-ol

C. sodium carbonate and sodium hydrogencarbonate D. sodium sulphite and sodium sulphate

28. 2000/II/13

Consider the compounds represented by the two structures below:

Which of the following statements concerning these compounds is correct?

A. Both compounds can turn wet blue litmus paper red B. Both compounds have the same odour

C. Both compounds have the same molecular formula D. Both compounds have the same boiling point

29. 2000/II/21

Which of the following processes requires a catalyst?

A. preparation of ethyl ethanoate from ethanoic acid and ethanol

B. conversion of sulphur trioxide to concentrated sulphuric acid

C. manufacture of chlorine bleach from brine

D. reduction of iron(III) oxide to iron

30. 2001/II/12

Which of the following processes is NOT involved in the production of ethanol from crude oil?

A. cracking B. fermentation C. catalytic hydration D. fractional distillation

31. 2001/II/21

Which of the following statements concerning ethanol and butan-2-ol is INCORRECT?

A. Both compounds can dissolve iodine

B. Both compounds can be represented by the same general formula

C. The boiling point of ethanol is higher than that of butan-2-ol

D. Each compound can be obtained by catalytic hydration of the corresponding alkene


145

32. 2001/II/25

The reaction involved in the preparation of ethanoic acid from ethanol is

A. an addition B. a condensation C. a redox D. a dehydration

33. 2001/II/50

1st statement 2

nd statement

The reaction of ethanoic acid with Water is one of the products formed

ethanol is a neutralization. in the reaction of ethanoic acid with ethanol.

34. 2002/II/12

Which of the following reactions does NOT require the use of a catalyst?

A. conversion of ammonia to nitrogen monoxide (Out of Syll.) B. hydration of ethene to give ethanol

C. oxidation of ethanol to ethanoic acid D. fermentation of glucose to give ethanol

35. 2002/II/43

In which of the following processes will carbon dioxide be produced?

(1) the fermentation of glucose solution

(2) the biodegradation of animal faeces

(3) the treatment of car exhaust in a catalytic converter


36. 2003/II/17

An organic compound has the following structure:

H C

H

CH3

C OH

H

CH3

The systematic name of this compound is

A. 1,2-dimethylethanol B. 1-methylpropan-1-ol C. 1-methylpropan-2-ol D. butan-2-ol

37. 2003/II/38

The structures of two organic compounds are shown below:

Which of the following statements concerning these two compounds is/are correct?

(1) They have the same relative molecular mass

(2) They have the same chemical properties

(3) They are both soluble in water



146

38. 2003/II/41

Which of the following health problems are related to the excessive drinking of alcoholic beverages?

(1) depression

(2) hepatics

(3) stomach ulcer


39. 2004/II/4

Which of the following substances is the poorest electrical conductor?

A. vinegar B. household bleach C. soap solution D antiseptic alcohol

40. 2004/II/17

The following paragraph was extracted from the laboratory report of a student on the preparation of an organic

compound.

Which of the following statements concerning the experiment is correct?

A. The compound prepared was ethyl ethanoate

B. Concentrated H2SO4 acted as an oxidizing agent

C. The preparations involved a condensation

D. When the resultant mixture was added to the cold water, a white precipitate was formed

41. 2004/II/27

Ethene can be prepared by heating ethanol with excess concentrated sulphuric acid. The reaction involved can be

represented by the equation:

2 43 2 2 2 2

conc.H SOCH CH OH CH = CH + H O→

The type of reaction involved in the preparation is

A. cracking B. condensation C. addition D. dehydration

42. 2004/II/33

Which of the following processes is/are involved in the production of whisky?

(1) heating under reflux

(2) distillation

(3) fermentation


CH3CH2CO2H and CH3CH2OH were heated with a small amount of concentrated H2SO4 in a test

tube for a few minutes. The resultant mixture was then added to a beaker of cold water.


147

43. 2004/II/46

1st statement 2

nd statement

Methanoic acid is a non-electrolyte. Methanoic acid is a covalent compound.

44. 2005/II/21

Which of the following molecular formulae represents an alkanoic acid?

A. CH2O B. CH2O2 C. C2H2O2 D. C2H6O2

45. 2005/II/24

Which of the following health hazards are related to excessive drinking of spirits?

(1) liver damage

(2) stomach damage

(3) lung damage


46. 2006/II/19

Which of the following experiments is dangerous and should NOT be attempted?

A. evaporating some ethanol in a beaker with busner burner

B. adding a small piece of sodium into a through water

C. heating copper(II) oxide with carbon powder in a crucible

D. preparing hydrogen by electrolysis of dilute sulphuric acid

47. 2007/II/16

A mixture containing 25 cm3

of CH3CH2CH2OH, 25 cm3

of CH3COOH and 1 cm3

of concentrated

H2SO4 is heated under influx. After some time, a pleasant smell is detected. Which of the following

statements concerning this experiment is correct?

A. A redox reaction is involved B. The reaction cannot go to decomposition

C. Concentrated H2SO4 acts as a reactant D. One of the products is ethyl propanoate

48. 2007/II/23

Which of the following statements concerning is/are correct?

(1) It is neutral to litmus solution

(2) Its systematic name is propanol

(3) When it reacts with ethanoic acid, the ester formed is



148

49. 2008/II/6

An organic compound has the following structure:

The systematic name of this compound is

A. 2-ethylpropan-2-ol B. 2-methylbutan-1-ol

C. 2-methylbutan-2-ol D. 1,1-dimethyylpropan-1-ol

50. 2008/II/31

Organic compound Q has the following composition by masses:

C : 37.5% H : 12.5% O : 50.0 %

What is the possible chemical formula Q? (Relative atomic masses : H = 1.0, C = 12.0, O = 16.0)

A. CH3OH B. C2H5OH C. HCOOH D. CH3COOH

51. 2008/II/47

The empirical formula of an organic compound T is CH2O. Effervescence occurs when T is added to sodium

carbonate solution. T may be

(1) HCOOCH3

(2) CH3CH(OH)COOH

(3) CH3CH2CH2COOH



149

1. 1990/II/40 (Out of Syll.)

When a piece of plastic X is placed on a hot plate at about 200°C, it starts to soften. When X is placed in a

flame, it burns with yellow flame and liberates smoke with a vinegar smell. X is likely to be

A. polythene B. polyvinyl chloride C. cellulose ethanote D. urea methanal

2. 1990/II/41

Which of the following polymers is/are made by condensation polymerization?

A. (1) B. (3) C. (1) and (2) D. (2) and (3)

3. 1991/II/26

Teflon, a polymer used for coating non-stick cooking utensils, has the structure given below:

Which of the following is the monomer for Teflon?

A. 1,2-difluoroethane B. 1,2-difluoroethene

C. 1,1,2,2-tetrafluoroethane D. 1,1,2,2-tetrafluoroethene

4. 1991/II/27

A sample of polymer gives acid fumes on strong heating. The polymer is probably

A. nylon B. polypropene C. polystyrene D. polyvinyl chloride

5. 1991/II/40

Which of the following compounds would react with each other to form a condensation polymer?

A. (1) and (2) B. (1) and (3) C. (2) and (4) D. (3) and (4)

6. 1992/II/25

The polymer formed by H2N- (CH2)6-NH2 and

A. has a formula of

B. is a thermosetting plastic

C. has cross-linkages

D. burns with a floral smell (Out of Syll.)

HKCEE CHEMISTRY | 8.1 Plastics | P.1

150

7. 1992/II/43

Which of the following polymers is/are NOT suitable for making a container for boiling water?

(1) perspex (2) urea-methanol (3) polyvinyl chloride


8. 1992/II/47

1st statement 2

nd statement

Polyester is a thermoplastic. Polyester is formed by condensation polymerization.

9. 1993/II/34

When concentrated sulphuric acid is added dropwise to a solution containing urea and methanal in a test

tube with shaking, a white solid can be formed. Which of the following statements about this experiment is/are

correct?

(1) The reaction involved is condensation polymerization.

(2) Concentrated sulphuric acid acts as an oxidizing agent.

(3) The white solid is a thermoplastic substance.


10. 1993/II/35

A polymer has the following structure:

Its monomer is

A. chloroethene B. 1,1-dichloroethane C. 1,2-dichloroethene D. 1,2-dichloroethane

11. 1994/II/20

X is a synthetic polymer. On gentle heating, it softens and chars. On strong heating, it burns with an acidic smell.

X is probably

A. polypropene B. polystyrene C. polyvinyl chloride D. perspex

12. 1995/II/22

The formula below can be used to represent the structure of some polymers.

C

H

H

C

H

X

C

H

H

C

H

X

... ...


X Name of polymers X Name of polymers

A. H Polyethene B. Cl Polyvinyl chloride

C. CH3 Perspex D. C6H5 Polystyrene


151

13. 1995/II/36

Which of the following substances concerning urea-methanal is/are correct?

(1) It softens on gentle heating.

(2) It can be used to make ash trays.

(3) It consists of polymer chains with cross-linkages between the chains.


14. 1995/II/41

Which of the following statements concerning the recycling of plastics are correct?

(1) The recycling of plastics can help to solve the disposal problem of plastics

(2) The recycling of plastics can save raw materials derived from petroleum

(3) It is difficult to separate different types of plastics in the recycling process


15. 1995/II/47

1st statement 2

nd statement

Nylon softens on heating. Nylon is a condensation polymer.

16. 1996/II/5

Which of the following materials are suitable for making the base and handle of a frying pan?

Base Handle Base Handle

A. aluminium polyvinyl chloride B. copper urea-methanal

C. titanium polyvinyl chloride D. zinc urea-methanal

17. 1996/II/34

Which of the following statements concerning nylon and urea-methanal is/are correct?

(1) They are formed by condensation polymerization

(2) They have cross-linkages between polymer chains

(3) They are nitrogen-containing compounds


18. 1997/II/40

Which of the following methods can be used to solve the pollution problems associated with the disposal

of plastic waste?

(1) recycling of plastic

(2) making biodegradable plastic

(3) burning plastic waste in incinerators with tall chimneys



152

19. 1998/II/36

Which statements concerning polystyrene is/are correct?

(1) It is a condensation polymer

(2) It can be remolded

(3) It can be used to make packaging material for electrical appliances


20. 1998/II/49

1st statement 2

nd statement

Wash bottles used in the chemistry laboratory Polyethene is an addition polymer.

are commonly made of polyethene.

21. 1999/II/28

Which of the following substance is a thermoplastic as well as a condensation polymer?

A. nylon B. perspex C. polyethene D. urea-methanal

22. 1999/II/41

Plastic X has the following structure:

Which of the following statements concerning X are correct?

(1) The monomer of X is CHCI=CHCI

(2) X can be used to make electric sockets

(3) The flue gas produced by the incineration of X can cause the formation of acid rain


23. 2000/II/15

A polymer has the following structure :

What is the monomer of this polymer?

A. butane B. but-1-ene C. but-2-ene D. 2-methylpropene


153

24. 2000/II/32

Which of the following articles should be made from thermosetting plastics?

(1) wall paper

(2) television casing

(3) water bucket


25. 2000/II/36

Which of the following polymers is/are made by condensation polymerization ?


26. 2000/II/38

Some concentrated sulphuric acid was poured into a sink connected to a catchpot made of polyvinyl

chloride (PVC). After some time, the catchpot became deformed. Which of the following explanations for the

deformation of the catchpot is/are correct?

(1) The heat liberated when the concentrated sulphuric acid mixed with the water in the catchpot caused

PVC to soften

(2) PVC was decomposed into its monomers by the concentrated sulphuric acid

(3) PVC was oxidized by the concentrated sulphuric acid


27. 2001/II/9

Which of the following statements concerning uses of plastics is correct?

A. Perspex is used for making ash trays.

B. Polyvinyl chloride is used for making raincoats.

C. Polystyrene is used for making floor tiles.

D. Nylon is used for making packaging materials for electrical appliances.


154

28. 2001/II/17

Which of the following compounds is a monomer of polyvinyl chloride (polychloroethene) ?

A. CH2=CHCl B. CH2=CCl2 C. CHCl=CHCl D. CCl2=CCl2

29. 2001/II/45

1st statement 2

nd statement

Urea-methanal is used to make electric plugs. Urea-methanal is a condensation polymer.

30. 2002/II/20

The monomer of polymer X is chloroethene. Which of the following statements concerning X is correct?

A. X is a condensation polymer. B. X is a thermosetting plastic.

C. X is used in making drainage pipes. D. The repeating unit of X is as follows :

31. 2003/II/36

Which of the following statements concerning thermoplastics is/are correct?

(1) They soften upon heating

(2) They are cross-linked polymers

(3) They are addition polymers


32. 2003/II/48

1st statement 2

nd statement

Polyethene is used for making the handle of frying pans. The shape of the polyethene handle remains

unchanged during frying process.

33. 2004/II/15

The structure of polymer X can be represented by

What is monomer of X?

A. 1,1-dimethylethene B. 1,2-dimethylethene C. methlylpropene D. but-1-ene

34. 2004/II/25

Which of the following statements concerning urea-methanal is correct?

A. Its polymer chains are cross-linked

B. It has a high tensile strength

C. It is an addition polymer

D. Urea-methanal wastes can be recycled by melting and remolding


155

35. 2004/II/41

Which of the following statements concerning polyvinyl chloride (PVC) are correct?

(1) PVC is used in making raincoats

(2) PVC softens upon gentle heating

(3) When PVC is strongly heated, fumes with an irritating odour are emitted


36. 2005/II/49

1st statement 2

nd statement

Polyester is an addition polymer. Polyester softens on heating.

37. 2006/II/43

The repeating unit of polymer X is shown below:

C(CH2)4

O

C

O

N(CH2)6N

H H Which of the following statements about X is/are correct?

(1) X is an addition polymer

(2) X is formed from two different monomers

(3) X is a thermosetting plastic


38. 2006/II/45

In an experiment to prepare a polymer, equal volumes of styrene and kerosene are mixed and then heated under

reflux for about an hour. After cooling, the resulting mixture is poured into a large volume of methanol. A white

waxy solid is formed. Which of the following statements concerning the experiment are correct?

(1) The experiment should be conducted in a fume cupboard

(2) The mixture of styrene and kerosene is heated under reflux because kerosene is volatile

(3) Methanol reacts with styrene to form the waxy solid


39. 2006/II/49

1st statement 2

nd statement

Both ethene and polyethene can decolorize Both ethene and polyethene belong to

a solution of bromine in an organic solvent. the same homologous series

40. 2007/II/9

Which of the following items can be made from polystyrene?

A. clothing B. food wrap C. electric socket D. packaging material


156

41. 2007/II/41

Which of the following items does NOT require the use of the products obtained from electrolysis of brine?

A. manufacture of soaps B. manufacture of polyethene

C. manufacture of bleaches D. manufacture of hydrochloric acid

42. 2007/II/42

Which of the following pairs of compounds can form condensation polymers?


43. 2008/II/25

Which of the following statements concerning thermosetting plastics and thermoplastics are correct?

(1) Thermosetting plastics contain strong covalent bonds while thermoplastics do not.

(2) Thermosetting plastics do not soften on heating while thermoplastics do.

(3) Thermosetting plastics are less flammable than thermoplastics.


44. 2008/II/41

Which of the following statements concerning plastics is INCORRECT?

A. Polyester is a thermoplastic formed by condensation on polymerization.

B. Perspex is a thermoplastic formed by additional polymerization.

C. Nylon is a thermosetting plastics formed by condensation and polymerization.

D. Urea-methanol is a thermosetting plastic formed by condensation polymerization.


157

1. 1990/II/37

Clothes stained with grease can be cleaned by detergents because detergents can

(1) decrease the surface tension of water

(2) dissolve in both water and grease

(3) emulsify greasy particles


2. 1990/II/38

Which of the following statements concerning the production of soap from vegetable oils and sodium hydroxide

is/are correct?

(1) Sodium hydroxide acts as a catalyst

(2) Glycerol is formed at the end of the reaction

(3) The reaction between vegetable oils and sodium hydroxide solution is reversible


3. 1991/II/33

Which of the following statements is/are true for soapless detergents?

(1) All soapless detergents are not biodegradable

(2) Soapless detergents form a scum with sea water

(3) Soapless detergents are mainly manufactured from products of the petroleum industry


4. 1991/II/49

1st statement 2

nd statement

In the preparation of soap, sodium chloride is added after the Sodium chloride can increase the solubility

reaction between oil and sodium hydroxide has been completed. of soap.

5. 1992/II/22

Q. 5 and 6 refer to the making of soap as represented by the following reaction:

What is/are the function(s) of the sodium hydroxide in this reaction?

(1) to act as a catalyst

(2) to neutralize the acid formed during the reaction

(3) to lower the solubility of soap in water so as to salt out the soap


HKCEE ECONOMICS | 8.2 Detergent | P.1

158

6. 1992/II/23

Soap has a hydrophilic head and a hydrophobic tail. Which of the following combinations is correct?

hydrophilic head hydrophobic tail

A. Na + CH3 (CH2)16－

B. －COO − CH3 (CH2)16－

C. Na + CH3 (CH2)16 COO −

D. CH3 (CH2)16 COO − Na +

7. 1993/II/44

Which of the following statements is INCORRECT?

A. Tin is used for making food cans.

B. Sulphuric acid is used for making soap.

C. Ammonium chloride is used for making dry cells.

D. Chlorine is used for sterilizing drinking water.

8. 1994/II/24

Q.8 and 9 refer to the structural formulae of the following three detergents:

Which of the above is/are soapless detergent(s)?

A. detergent I only B. detergent III only

C. detergent I and II only D. detergent II and III only

9. 1994/II/25

Which of the following statements concerning these detergents is correct?

A. The hydrocarbon tail of detergent III is hydrophilic

B. Both detergents I and II form scum with seawater

C. Detergent III causes more serious pollution problems than detergent I when discharged into rivers

D. Both detergents II and III are made from fats


159

10. 1996/II/18

When a little detergent is added to a drop of water on a piece of woollen cloth as shown above, the drop spreads.

Which of the following statement correctly explains this observation?

A. The detergent dissolves readily in water B. The detergent has a polar end which is hydrophilic

C. The detergent can form an emulsion with water D. The detergent can reduce the surface tension of water

11. 1996/II/28

Q.11 and Q.12 refer to the following experiment used to study the causes of hardness of water.

A student added some soap solution to four test tubes containing the same volume of different aqueous solutions

of the same molarity. The shook the tubes and measured the minimum volume of soap solution needed to form a

permanent lather. The results are tabulated below:

Which of the following apparatus would be most suitable for measuring the volume of soap solution?

A. 50 cm3

burette B. 50 cm3

measuring cylinder

C. 25 cm3

pipette D. 10 cm3

beaker

12. 1996/II/29

Which of the following substances is/are responsible for the hardness of water?

(1) sodium chloride

(2) calcium chloride

(3) potassium chloride

(4) magnesium chloride


13. 1997/II/35

Dilute ammonia solution is used in domestic glass cleansers because

(1) it can saponify grease.

(2) it is non-corrosive.

(3) it contains ammonium ions which can emulsify grease.

Which of the following statements is/are correct?


Aqueous solution Minimum volume of soap solution needed to form a permanent lather/cm3

Sodium chloride 0.6

Calcium chloride 9.3

Potassium chloride 0.9

Magnesium chloride 8.5


160

14. 1998/II/15

A detergent has the following structure:

Which of the following statements concerning the detergent is correct?

A. Its hydrocarbon chain is hydrophilic

B. It can be manufactured from vegetable

C. It is readily degraded by micro-organisms

D. It acts as an emulsifier in the cleaning process

15. 1998/II/41

Which of the following problems are associated with the excessive use of soapless detergents?

(1) They can cause skin allergies

(2) They form foam when discharged into rivers and lakes

(3) They form scum when discharged into the sea


16. 1999/II/43

Which of the following statements concerning a soapless detergent are correct?

(1) It can be prepared by heating a cooking oil with sodium hydroxide solution

(2) It acts as a wetting agent by reducing the surface tension of water

(3) It acts as an emulsifying agent in the cleaning process


17. 1999/II/48

1st statement 2

nd statement

Local tap water produces a scum with soap. Water containing calcium ions can form an insoluble compound

with soap.

18. 2000/II/41

Which of the following statements concerning soaps are correct?

(1) They are esters

(2) They can reduce the surface tension of water

(3) Their aqueous solutions are alkaline



161

19. 2001/II/16

Which of the following statements is correct for a soapy detergent but incorrect for a soapless detergent?

A. Its structure consists of a hydrophilic part and a hydrophobic part

B. It forms lather when shaken with distilled water

C. It can be made by reacting a vegetable oil with an alkali.

D. It acts as an emulsifier in the cleaning process

20. 2002/II/21

In a boiler using hard water, scale is deposited on its interior after a period of time. The scale consists mainly of

metal carbonates. Which of the following substances can be used to remove the boiler scale?

A. soapless detergent B. chlorine bleach C. sodium hydroxide solution D. vinegar

21. 2002/II/35

A student heated a mixture of fat and sodium hydroxide solution for some time. He then added the mixture to

a beaker of saturated sodium chloride solution. A white solid was formed. Which of the following statements

concerning this experiment is/are correct?

(1) The reaction between fat and sodium hydroxide is esterification

(2) The white solid is a soap

(3) The white solid contains salts of alkanoic acids


22. 2003/II/19

Soap was prepared by heating fat with sodium hydroxide solution for some time. Concentrated sodium chloride

solution was then added to the result mixture. The purpose of adding concentrated sodium chloride solution is

A. to help the precipitation of the soap B. to enhance the cleansing power of the soap

C. to reduce the alkalinity of the soap D. to act as a preservative for the soap

23. 2003/II/29

A detergent has the structure shown below:

Which of the following statements concerning this detergent is correct?

A. It is non-biodegradable B. If functions well in hard water

C. It can be manufactured from vegetable oils D. The portion, CH3 (CH2)10 CH2- , is hydrophilic

24. 2004/II/49

1st statement 2

nd statement

Sodium chloride is used in the manufacture of soap. Sodium chloride helps the precipitation of

soap from soap solution


162

25. 2005/II/32

Which of the following substances is NOT used for the preparation of soaps?

A. vegetable oil B. sodium hydroxide solution

C. concentrated sodium chloride solution D. concentrated sulphuric acid

26. 2005/II/42

Which of the following statements concerning soaps are correct?

(1) Soaps are biodergradble

(2) Soaps have good cleaning power in hard water

(3) The structure of a soap particle consists of a hydrophilic part and a hydrophobic part


27. 2006/II/26

Which of the following statements concerning the cleansing action of a detergent are correct?

(1) It reduces the surface tension of water

(2) It acts as an emulsifying agent

(3) It reacts with grease to from soluble products


28. 2006/II/42

Which of the following materials is/are used in the production of soap?

(1) petroleum fractions

(2) sodium hydroxide

(3) sulphuric acid


29. 2007/II/50

1st statement 2

nd statement

Soapy detergent can be used to treat oil spillage Soapy detergent can act as an emulsifying

on sea surface. agent for oil.

30. 2008/II/35

Which of the following statements concerning a soapy detergent is correct?

A. It can increase the surface tension of water

B. It contains a hydrophilic hydrocarbon chain

C. It can be manufactured from petroleum products

D. It contains a positive ionic part for carrying out emulsifying


163

1. 1990/II/30

Which of the following methods can be used to obtain sodium chloride from a solid mixture containing

sodium chloride and ammonium chloride?

A. heating

B. adding water and filtering

C. adding sodium hydroxide solution and filtering

D. adding silver nitrate solution and filtering

2. 1993/II/12

A mixture contains copper powder and zinc powder. In order to remove the zinc powder, the mixture is

heated with an acid and filtered. Which of the following acids should be used?

A. dilute nitric acid

B. concentrated nitric acid

C. dilute sulphuric acid

D. concentrated sulphuric acid

3. 1995/II/14

A mixture consist of two solids, sodium chloride and lead (II) oxide. Which of the following methods can

be used to remove the sodium chloride from the mixture?

A. add water to the mixture and then filter

B. add concentrated sulphuric acid to the mixture and then filter

C. add dilute nitric acid to the mixture and then filter

D. add dilute sodium hydroxide solution to the mixture and then filter

4. 1996/II/16

Which of the following methods can be used to separate the colorings in brown chocolate beans?

A. filtration B. crystallization C. paper chromatography D. fractional distillation

5. 1996/II/33

A mixture contains only copper (II) oxide and anhydrous copper (II) sulphate. Which of the following

methods can be used to separate copper (II) oxide from the mixture?

(1) Add water to the mixture and then filter

(2) Add dilute nitric acid to the mixture and then filter

(3) Add concentrated hydrochloric acid to the mixture and then filter


HKCEE ECONOMICS | 9.1 Separation of mixtures | P.1

164

6. 1998/II/26

Some physical properties of a compound X are listed below:

Melting point : 82°C

Boiling point : 221°C

Solubility in water : soluble

Which of the following is the most appropriate method to obtain X from a solution of X in water ?

A. decantation B. crystallization C. fractional distillation D. paper chromatography

7. 2002/II/22

Which of the following methods should be used to obtain hydrated copper(II) sulphate from copper(II)

sulphate solution ?

A. crystallization B. distillation C. fractional distillation D. heating under reflux

8. 2004/II/9

Which of the following methods can be used to obtain water from a mixture of copper powder and copper(II)

sulphate solution?

A. distillation B. decantation

C. filtration followed by crystallization D. filtration followed by evaporation

9. 2005/II/19

Which of the following correctly describes the sequence of procedures to separate sand, salty and water from a

mixture of sand and salt solution?

A. filtration, evaporation

B. filtration, distillation

C. crystallization, filtration

D. crystallization, filtration, distillation

10. 2007/II/6

Which of the following processes would be involved in order to separate Cu2+

(aq) ions from a mixture

containing Cu2+

(aq) and K+ (aq) ions?

A. performing a flame test

B. evaporating the mixture

C. using a separating funnel

D. adding NaOH(aq) to the mixture


165

11. 2008/II/26

Which of the following processes can be performed by normal use of some or all of the above apparatus?

(1) refluxing a reacting mixture

(2) separating two immiscible liquids

(3) performing a simple distillation


12. 2008/II/34

From which of the following processes can lead be obtained in s school laboratory?

A. Lead(II) oxide is heated strongly

B. Lead(II) oxide is mixed with carbon

C. Dilute lead(II) nitrate solution is electrolyzed

D. Zinc is added to dilute lead(II) nitrate solution

13. 2008/II/49

1st statement 2

nd statement

Fractional distillation can convert large alkane Fractional distillation involves breaking and

molecules to smaller alkane molecules and alkene molecules. forming of covalent bonds.


166

1. 1991/II/12

Which of the following tests should be used to detect the presence of sulphite ions in a given solution X?

A. On adding barium chloride solution to X, a white precipitate is formed

B. On adding lead(II) nitrate solution to X, a white precipitate is formed

C. On adding dilute sulphuric acid to X, a colourless gas ions evolved which can decolorize acidified

potassium permanganate solution

D. On adding dilute nitric acid to X, a reddish-brown gas is evolved

2. 1992/II/35

Which of the following regent can be used to distinguish between Fe2+

(aq) and Fe3+

(aq) ions?

(1) ammonia solution

(2) concentrated nitric acid

(3) acidified potassium permanganate solution


3. 1992/II/40

Which of the following can be used to distinguish between dilute hydrochloric acid and dilute nitric acid?

(1) copper

(2) silver nitrate solution

(3) sodium hydrogencarbonate solution


4. 1994/II/44

Which of the following methods can be used to distinguish between solid sodium carbonate and calcium

carbonate?

(1) heating the solid and testing the gaseous product with lime water

(2) testing the solubility of the solid in water

(3) conducting a flame test on the solid


5. 1996/II/17

A gardener bought a bag potassium nitrate and a bag of ammonium sulphate, to be used as fertilizers. He forgot

to label the bags. Which of the following tests would enable him to distinguish between the two chemicals?

A. heating each chemical with dilute sulphuric acid

B. heating each chemical with sodium chloride solution

C. heating each chemical with potassium hydroxide solution

D. heating each chemical with acidified potassium dichromate solution

HKCEE ECONOMICS | 9.2 Tests for substances | P.1

167

6. 1997/II/36

Which of the following substances can be used to distinguish between concentrated nitric acid and concentrated

sulphuric acid?

(1) sodium carbonate power

(2) copper turnings

(3) cane sugar


7. 2001/II/1

Which of the following ions is responsible for the yellow colour of topaz?

A. Mn +2 B. Mn +3 C. Fe +2 D. Fe +3

8. 2002/II/37

Which of the following methods can be used to distinguish between iron(II) sulphate solution and iron(III)

sulphate solution ?

(1) observing their colours

(2) adding acidified potassium permanganate solution

(3) adding aqueous ammonia


9. 2003/II/2

Which of the following substances, upon heating in a test tube, would undergo a chemical change?

A. water B. calcium oxide C. sodium chloride D. hydrated copper(II) sulphate

10. 2003/II/42

Iron pyrite (FeS2) looks like gold and its common name is “fool’s gold”. Which of the following methods

can be used to distinguish iron pyrite from gold?

(1) comparing their densities

(2) comparing their electrical conductivity

(3) comparing the effect of heat on them


11. 2004/II/10

Which of the following combinations concerning the properties of gases is INCORRECT?

Gas Property

A. ammonia has an irritating colour

B. methane dissolves readily in water

C. carbon monoxide can burn in air

D. nitrogen monoxide changes from colourless to brown when exposed to air


168

12. 2004/II/11

A white solid is found around the mouth of a reagent bottle containing lime water. The white solid is likely

to be

A. calcium oxide B. calcium sulphate C. calcium carbonate D. calcium hydrogencarbonate

13. 2004/II/38

A counterfeit gold coin is made from an alloy of copper and zinc. Which of the following methods can be used to

show that the coin is NOT made of pure gold?

(1) determining its density

(2) treating it with dilute nitric acid

(3) treating it with dilute hydrochloric acid


14. 2005/II/5

When a flame test is performed on copper(II) chloride, what is the colour of the flame observed?

A. golden yellow B. pale purple C. brick-red D. bluish-green

15. 2006/II/15

X is an aqueous solution. When X is added in excess to bromine water, the resulting solution is colourless.

When X is treated with dilute hydrochloric acid, a gas with an irritating smell evolves. X may be

A. sodium sulphite solution B. sodium hypochlorite solution

C. ammonium hydrogencarbonate solution D. ammonium nitrate solution

16. 2006/II/17

Gas X is bubbled into solution Y as shown below :

Which of the following combinations would give no visible change in the test tube?

X Y

A. sulphur dioxide sodium iodide solution

B. ethene acidified potassium permanganate solution

C. chlorine litmus solution

D. carbon dioxide calcium hydroxide solution


169

17. 2006/II/46

There are two unlabelled bottles in the laboratory. One of the bottles contains an aqueous solution of common

salts and the other contains antiseptic alcohol. Which of the following methods can be used to distinguish the

substances in the bottles?

(1) adding a small amount of water

(2) detecting their odour

(3) measuring their electrical conductivity



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