ocr a level chemistry a multip(le choice question...
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OCR A Level Chemistry A Multip(le Choice Question quiz (5.3 Transition elements)
Multiple Choice Questions (MCQ) topic quiz5.3 Transition elementsInstructions and answers for teachers
These instructions cover the learner activity section which can be found on page 8. This Lesson Element supports OCR A Level Chemistry A.
When distributing the activity section to the learners either as a printed copy or as a Word file you will need to remove the teacher instructions section.
The Activity
This Lesson Element is a teaching and learning resource containing 10 multiple choice questions (MCQs) on the theme of transition elements and qualitative analysis. Some questions might require synoptic thinking, using knowledge and ideas from various topics across the full A Level content.
This resource can be used to test and consolidate understanding at the end of a topic or to revisit and refresh knowledge at a later point in the course.
Learning Outcomes
This lesson element relates to the specification learning outcomes 5.3.1(a), 5.3.1(b), 5.3.1(d), 5.3.1(e), 5.3.1(f), 5.3.1(h), 5.3.1(j), 5.3.1(l), 5.3.2(a)
Introduction
Multiple choice questions allow rapid coverage of a wide range of sub-topics.
Contrary to a widespread belief among students, multiple choice questions are not necessarily easy they can be easy, moderate or difficult.
The questions are written so that the incorrect answers are plausible distractors based on common errors or misconceptions.
The questions in this quiz cover topics mainly from specification sections:
5.3 Transition elements
Multiple Choice Questions (MCQ) topic quiz answers
1. Atoms of which transition element have only 1 electron in the 4s sub-shell?
A
chromium
Correct answer: Chromiums outer electron configuration is 4s13d5.
B
cobalt
Both of the metals that have one electron in the 4s subshell begin with C (copper and chromium) and so the learner may have tried to rote learn rather than work out the metals.
C
scandium
Scandium has one electron in its 3d subshell, not the 4s.
D
zinc
The learner may be thinking of zinc as being an exception to the usual rules (it is not a transition metal) but is confused about the reason why.
Your answer
2. Which is an example of a bidentate ligand?
A
H2O
Incorrect, this is monodentate
B
Cl
Incorrect, this is monodentate
C
H2NCH2CH2NH2
Correct answer: The lone pairs on the two nitrogen atoms can form coordinate bonds with a metal or metal ion.
D
OH
Incorrect, this is monodentate.
Your answer
3. What colour change would you observe in the following reaction?
[Cu(H2O)6]2+ + 4Cl
!
[CuCl4]2 + 6H2O
A
pale blue solution, to blue precipitate, to dark blue solution
This represents the gradual addition of ammonia solution.
B
pale blue solution to yellow/green solution
Correct answer: The colour is a mixture of the reactant and the pale yellow product.
C
pale blue solution to pale blue precipitate
This represents the addition of hydroxide ions.
D
violet solution, to grey-green precipitate, to purple solution
They may have learned some colour changes by rote and picked the wrong one; this is the formation of [Cr(NH3)6]3+ from [Cr(H2O)6]3+.
Your answer
4. Which electron configuration corresponds to a transition metal ion that forms a green solution?
A
[Ar] 4s23d6
Incorrect, this is the electron structure of Fe; they may have linked green to iron.
B
[Ar] 4s23d5
Incorrect, this is the electron structure of Mn.
C
[Ar] 4s03d5
Incorrect, this is the electron structure of Fe3+ which is brown; they may have linked green to iron.
D
[Ar] 4s03d3
Correct answer: aqueous Cr3+ is green in colour.
Your answer
5. Which electron configuration could correspond to a d-block metal ion that is colourless in solution?
A
1s22s22p63s23p63d8
They have not appreciated that the partially filled d-sub-shell corresponds to a transition metal ion, so the hydrated ion would be coloured.
B
1s22s22p63s23p63d10
Correct answer: This is the electron configuration of Zn2+.
C
1s22s22p63s23p64s23d5
Incorrect, a d-block metal ion must have lost its 4s electrons.
D
1s22s22p63s23p64s23d10
Incorrect, a d-block metal ion must have lost its 4s electrons; they may just have focused on the full d sub-shell.
Your answer
6. Which complex ion shows optical isomerism and stereoisomerism?
A
Incorrect, shows neither isomerism
B
Incorrect, this complex shows stereoisomerism but the mirror image is superimposable.
C
Correct answer: H2O can be at 90 or 180, and the stereoisomer shown has a non-superimposable mirror image.
D
Incorrect, this complex shows optical isomerism, but there is no alternative stereochemistry possible.
Your answer
7. All these complex ions contain metal ions. Charges are not shown.
Which complex ion has no overall charge?
A
[CuCl4]
This would have a charge of 2. They may have misremembered the charge on the Cu ion.
B
[Cu(OH)2(H2O)4]
Correct answer: Copper exists as the Cu2+ ion in this complex. The charge is balanced by the 2 OHions.
C
[Al(H2O)6]
This has a charge of 3+. They may have disregarded the information that the metal is in ionic form.
D
[Al(OH)4]
This has a charge of 1. They may have made an error in determining the charge on the aluminium ion.
Your answer
8. Which statement is true of the following reaction?
3Ni2+(aq) + 2Al(s) ( 2Al3+(aq) + 3Ni(s)
A
The aluminium is oxidised; the aluminium acts as an oxidising agent.
They may think that the thing that is oxidised is the oxidising agent.
B
The aluminium is reduced; the aluminium acts as an oxidising agent.
This is the opposite to the correct answer; they may have remembered red/ox the wrong way round.
C
The nickel ions are reduced; the nickel acts as an oxidising agent.
Correct answer.
D
The nickel ions are reduced; the nickel acts as a reducing agent.
They may think that the thing that is reduced is the reducing agent.
Your answer
9. An unknown substance undergoes the following separate tests to determine its identity:
sodium hydroxide is added; a brown precipitate forms
nitric acid is added; no change is observed
barium nitrate is added; no change is observed
silver nitrate is added; a white precipitate is formed which dissolved in dilute ammonia
Identify the substance.
A
FeCO3
They are unclear on the colours for iron ions and the test for carbonates.
B
Fe2(SO4)3
They may be competent with cation tests but are unclear of the sulfate test.
C
FeCl2
They have the anion test correct but got the incorrect iron ion.
D
FeCl3
Correct answer
Your answer
10. Which test(s) would differentiate between (NH4)2SO4 and AlCl3?
1
Addition of NaOH(aq).
2
Addition of Ba(NO3)2.
3
Addition of AgNO3.
A
1, 2 and 3
They may have remembered the reagent for testing for NH4+ ions but forgotten that heating is required.
B
only 1 and 2
They may have made the mistake above, and only focused on positive tests for (NH4)2SO4.
C
only 2 and 3
Correct answer: Ba(NO3)2 will identify (NH4)2SO4 while AgNO3 will identify AlCl3.
D
only 1
Many errors here, possibly a guess.
Your answer
Multiple Choice Questions (MCQ) topic quiz5.3 Transition elementsLearner Activity
1. Atoms of which transition element have only 1 electron in the 4s sub-shell?
A
chromium
B
cobalt
C
scandium
D
zinc
Your answer
2. Which is an example of a bidentate ligand?
A
H2O
B
Cl
C
H2NCH2CH2NH2
D
OH
Your answer
3. What colour change would you observe in the following reaction?
[Cu(H2O)6]2+ + 4Cl
!
[CuCl4]2 + 6H2O
A
pale blue solution, to blue precipitate, to dark blue solution
B
pale blue solution to yellow/green solution
C
pale blue solution to pale blue precipitate
D
violet solution, to grey-green precipitate, to purple solution
Your answer
4. Which electron configuration corresponds to a transition metal ion that forms a green solution?
A
[Ar] 4s23d6
B
[Ar] 4s23d5
C
[Ar] 4s03d5
D
[Ar] 4s03d3
Your answer
5. Which electron configuration could correspond to a d-block metal ion that is colourless in solution?
A
1s22s22p63s23p63d8
B
1s22s22p63s23p63d10
C
1s22s22p63s23p64s23d5
D
1s22s22p63s23p64s23d10
Your answer
6. Which complex ion shows optical isomerism and stereoisomerism?
Your answer
7. All these complex ions contain metal ions. Charges are not shown.
Which complex ion has no overall charge?
A
[CuCl4]
B
[Cu(OH)2(H2O)4]
C
[Al(H2O)6]
D
[Al(OH)4]
Your answer
8. Which statement is true of the following reaction?
3Ni2+(aq) + 2Al(s) ( 2Al3+(aq) + 3Ni(s)
A
The aluminium is oxidised; the aluminium acts as an oxidising agent.
B
The aluminium is reduced; the aluminium acts as an oxidising agent.
C
The nickel ions are reduced; the nickel acts as an oxidising agent.
D
The nickel ions are reduced; the nickel acts as a reducing agent.
Your answer
9. An unknown substance undergoes the following separate tests to determine its identity:
sodium hydroxide is added; a brown precipitate forms
nitric acid is added; no change is observed
barium nitrate is added; no change is observed
silver nitrate is added; a white precipitate is formed which dissolved in dilute ammonia
Identify the substance.
A
FeCO3
B
Fe2(SO4)3
C
FeCl2
D
FeCl3
Your answer
10. Which test(s) would differentiate between (NH4)2SO4 and AlCl3?
1
Addition of NaOH(aq).
2
Addition of Ba(NO3)2.
3
Addition of AgNO3.
A
1, 2 and 3
B
only 1 and 2
C
only 2 and 3
D
only 1
Your answer
A
C
B
D
B
C
B
C
D
C
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