AQA A Level Chemistry

Topic Questions

6.2 Transition Metals (A Level only)

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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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

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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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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