11 mark
Which of the following is not a common shape for a transition metal complex ion?
Linear
Trigonal planar
Tetrahedral
Octahedral
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Transition Metals (A Level only) (AQA A Level Chemistry)
Exam Questions
4 hours30 questions
21 mark
The atomic number of chromium is 24. What is the full electronic configuration of a chromium atom?
1s22s22p63s23p64s23d4
1s22s22p63s23p63d6
1s22s22p63s23p64s13d5
1s22s22p63p64s13d5
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31 mark
Which of the following can change the colour of transition metal complexes?
|
|
Changes in the type of ligand |
Changes in oxidation state |
Changes in coordination number |
|
A |
✓ |
✓ |
✓ |
|
B |
✓ |
✓ |
X |
|
C |
X |
✓ |
✓ |
|
D |
✓ |
X |
X |
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41 mark
Which row shows an incorrect colour or ion for vanadium?
|
|
Ion |
Colour |
|
A |
VO2+ |
yellow |
|
B |
V4+ |
blue |
|
C |
V3+ |
green |
|
D |
V2+ |
purple |
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51 mark
Many redox titrations are self-indicating. Which row shows a correct colour change at the end point in a redox titration?
|
|
Reaction |
Colour change |
|
A |
MnO4- → Mn2+ |
colourless → purple |
|
B |
MnO4- → Mn2+ |
purple → colourless |
|
C |
Cr2O72- → Cr3+ |
green → orange |
|
D |
I2 → 2I- |
yellow → colourless |
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11 mark
Transition metals are used as catalysts.
Which row is correct?
|
|
Transition metal present in the catalyst used in the Haber Process |
Transition metal present in the catalyst used in the Contact Process |
|
A |
iron |
nickel |
|
B |
iron |
vanadium |
|
C |
vanadium |
iron |
|
D |
vanadium |
vanadium |
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21 mark
The electron configuration of a transition metal ion is shown below
1s22s22p63s23p63d6
Which ion does this correspond to?
V2+
Mn2+
Fe2+
Ni2+
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31 mark
Ligands are found in transition metal complexes.
Which of the following rows contains a species that cannot act as a ligand?
H2O, NH3, Cl-
C2O42-, C6H4(OH)2, H2O
H2NCH2CH2NH2, EDTA4-, NH3
CN-, CH2CH2, OH-
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41 mark
Excess concentrated hydrochloric acid reacts with aqueous copper(II) ions.
What is the shape of the resulting complex ion?
octahedral
linear
tetrahedral
square planar
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51 mark
Transition metals form coloured ions.
What is the correct explanation for this at the atomic level?
electrons moving from d-orbitals of slightly higher energy to d-orbitals of lower energy
electrons moving from d-orbitals of lower energy to d-orbitals of slightly higher energy
electrons jumping from higher energy levels to the n=2 energy level
electrons absorb energy at one frequency and transmit it at another
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11 mark
Which species have the same shape?
|
|
[CuCl4]2- |
XeF4 |
[Pt(NH3)2Cl2] |
|
A |
✓ |
✓ |
✓ |
|
B |
✓ |
✓ |
x |
|
C |
x |
✓ |
✓ |
|
D |
✓ |
x |
x |
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21 mark
How many bonding electron pairs are found in [Fe(CN)6]3– ?
6
18
24
30
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31 mark
In which of the following ions do the electron configurations have unpaired electrons present?
|
|
Cr3+ |
Zn2+ |
Cu+ |
|
A |
✓ |
✓ |
✓ |
|
B |
✓ |
✓ |
x |
|
C |
x |
✓ |
✓ |
|
D |
✓ |
x |
x |
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41 mark
The excited electrons in a vanadium(II) ion absorb light at 580 nm as they jump between different d orbitals. What is the increase in energy, in kJ, for each electron excited?
Speed of light, c = 3.00 × 108 m s−1
Planck’s constant, h = 6.63 × 10−34 J s
3.42 x 10-28
1.28 x 10-51
3.42 x 10-19
3.42 x 10-22
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51 mark
Which complex(es) exhibit(s) stereoisomerism?
|
|
[Ag(NH3)2]+ |
[Co(C2O4)3]4– |
[Pt(NH3)2Cl2] |
|
A |
✓ |
✓ |
✓ |
|
B |
✓ |
✓ |
x |
|
C |
x |
✓ |
✓ |
|
D |
✓ |
x |
x |
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