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 (AQA A Level Chemistry)
Exam Questions
4 hours30 questions21 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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