AMU –PAST PAPERS

CHEMISTRY- UNSOLVED PAPER - 2007

SECTION – I

Single Correct Answer Type There are five parts in this question. Four choices are given for each part and one of them is

correct. Indicate you choice of the correct answer for each part in your answer-book by

writing the letter (a), (b), (c) or (d) whichever is appropriate

01Sn4+ + 3e- Sn2+ Eo = 0.13V

Br2 + 2e- 2Br- Eo = 1.08 V

Calculate Kep for the cell reaction for the cell formed by two electrodes

1041

1032

10-32

10-42

Problem

02Consider the reaction

Give the equilibrium constant for the formation of N2O4 from N2 and O2

a.

b.

c.

d.

Problem

221

1 1KK

1 2

1K K

1 2

1K K

2

1

K

K

Problem03Half-life of radioactive element is 16 h. What time it will take for 75%

disintegration ?

a. 32 days

b. 32 h

c. 48 h

d. 16 h

Problem04Friedel – Craft acylation can be given by

a.

b.

c.

d. R – O - R

Problem05Which of the following is having maximum acidic strength ?

a.

b.

c.

d.

Problem06For the reaction Na2CO3 + 2HCl NaCl + H2O + CO2

Equivalent weight of Na2CO3 is :

a. M/2

b. M

c. 2M

d. M/4

Problem07Excited state configuration of Mn2+ is

a.

b.

c.

d.

42gt

3 22g gt e

4 22g gt e

5 02g gt e

Problem08Which of the following is thermosetting polymer ?

a. Nylon-6

b. Bakelite

c. Nylon-66

d. SBR

Problem09 Yellow or white ppt. Which of the following cannot be X ?

a.

b. (CH3) CHCl

c.

d.

3

3

AgNOHNOX

Problem10Rate of a reaction can be expressed by following rate expression

Rate=k[A]2 [B], if concentration of A is increased by 3 times, and concentration

of B increased by 2 times, how many times rate of reaction increases?

a. 9 times

b. 27 times

c. 18 times

d. 8 times

Problem11What is the reason for unusual high b.p of water?

a. Due to the presence H+ and OH- ions in water

b. Due to dipole-dipole interactions

c. Due to London forces

d. Strong London forces

Problem12Shine at freshly cut sodium is because of

a. Due to oscillation of free electrons

b. Due to weak metallic bonding

c. Due to by absorption of light in crystal lattice

d. Due to pressure of free valency at the surface

Problem13Most acidic oxide among the following is

a. Cl2O5

b. Cl2O

c. Cl2O3

d. Cl2O7

Problem14.

a.

b.

c.

d.

Problem15Which of the following statements is wrong?

a. Metals are more then non metals

b. There are only few metalloids

c. Hydrogen can be placed with alkali metals as well as with halogen in periodic

table

d. Non metals are more than metals

Problem16What volume of M/10 NaOH added in 50 mL, M/10 acetic solution to get a

buffer solution having highest buffer capacity?

a. 50mL

b. 25mL:

c. 10mL

d. 40mL

Problem17Monomers of nucleic acid is

a. Nucleotides

b. Nucleoxides

c. Aminoacids

d. Carboxylic acid

Problem18If the volume containing gas is compressed to half, how many moles gas

remained in the vessel?

a. Just double

b. Just half

c. Same

d. More than double

Problem19At same temperature calculate the ratio of average velocity of SO2 to CH4

a. 2:3

b. 3:4

c. 1:2

d. 1:6

Problem20If temperature of 1 mole of gas is increased by 500C, calculate the change in

kinetic energy of the system

a. 623.25J

b. 6.235J

c. 623.5J

d. 6235.0J

Problem21Give name of the complex, name should specify the position of ligands.

a. Bistransphosphinecarbonylchloroiridium [II]

b. carbonylchlrobistransphosphineridium [III]

c. carbonylchlrobistrasphosphineridium [I]

d. chiorocarbonylbistranssphosphineriridium [I]

Problem22Ozonolysis products of an olefin are and Olefin is

a.

b.

c.

d.

Problem23A bubble of volume V1 is in the bottom of a pond at 150C and 1.5 atm pressure

of 1atm

At 250C and have volume V2, give

a. 15.5

b. 0.155

c. 155.0

d. 1.55

2

1

V

V

Problem24Volume of 0.6M NaOH required to neutralize 30 cm3 of 0.4 M HCL is

a. 20 cm3

b. 40 cm3

c. 45 cm3

d. 30 cm3

Problem25The orbital angular momentum of an electron in 3 s orbital is

a.

b.

c.

d. zero

1.

2 2h

2h

1.

3 2h

Problem26Decomposition of H2O2 is prevented by

a. KOH

b. MnO2

c. Acetanilide

d. Oxalic acid

Problem27The bad smelling substance formed by the action of alcoholic caustic potash on

chloroform and aniline is

a. Nitrobenzene

b. Phenyl isocynaide

c. Phenyl cyanide

d. Phenyl isocyanide

Problem28What is the EAN of nickel in Ni(CO)4 ?

a. 38

b. 30

c. 36

d. 32

Problem29P4 + 3NaOH + 3H2O A + 3NaH2PO2 here A is

a. NH3

b. PH3

c. H3PO4

d. H3PO3

Problem30If solubility of calcium hydroxide is , then its solubility product will be

a. 27

b. 3

c. 9

d. 3

Problem31Which of the following compounds is optically active ?

a. (CH3)2CHCH2OH

b. CH3CH2OH

c. CCL2F2

d. CH3CHOHC2H5

Problem32Which compound is soluble in water ?

a. CS2

b. C2H5OH

c. CCL4

d. CHCL3

Problem33In a cubic structure of diamond which is made from X and Y, where X are at the

corners of the cube and Y at the face cehters of the cube. The molecular formula

of the compound is

a. X2Y

b. X3Y

c. XY2

d. XY3

Problem34Bithonal is an example of

a. Disinfectant

b. Antiseptic

c. Antibiotic

d. Analgesic

Problem35 A and B in the following reactions are

a.

b.

c.

d. A + RR’CH2CN,B=NaOH

Problem36Structure of XeF5

+ ion is

a. Trigonal bipyramidal

b. Square pyramidal

c. Octahedral

d. Pentagonal

Problem37Mark out the most unlike form of polymerization of CH2

a.

b.

c.

d.

Problem38

a.

b.

c.

d. No reaction

3 2HBrR N CH CH

Å

- = ¾¾®

3 3

Br

R N CH CHÅ

- -

3 2 2R N CH CH BrÅ

- - -

2 3CH CH N R B rÅ

= -e

Problem39Markout the enthalpy of formation of carbon monoxide (CO)

Given, C(s)+O2(g) CO(g) = - 393.3 kJ/mol

CO(g) + O2(g) CO2(g) = - 282.8 kJ/mol

a. 110.5 kJ/mol

b. 676.1 kJ/mol

c. 282.8 kJ/mol

d. 300.0 kJ/mol

12

H

H

Problem40The magnetic moment of a transition metal ion is 3,87 BM. The number of

unpaired Electrons present in it is

a. 2

b. 3

c. 4

d. 5

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