*P71912A01828*
PMT
*8 Transition metals and their compounds can act as catalysts in many reactions such as
the ones shown:
• platinum, Pt, in the catalytic converters of vehicles
• manganese(II) ions, Mn2+(aq), in the oxidation of ethanedioate ions, C O2–(aq),
Question
Chemistry
CAIE2021
Copper is a transition metal.
(a) State two general properties of transition metals that are not shown by the s-block metals in Period 4.
(b) Write the electronic configuration of Cu²⁺.
(c) Explain why transition metal compounds are often coloured.
[7 marks]
Mathematics
Edexcel2021
Transition metals form complex ions.
(a) Complex ions have a central metal ion surrounded by ligands.
(i) Give a reason why the ammonium ion cannot act as a ligand.
(1)
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(ii) Explain why the complex ions [Co(NH ) ]2+ and [Co(H O) ]2+ are coloured and
Question
Mathematics
Edexcel2020
*P62668A0424*
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PMT
(e) A student stated that ‘the elements scandium and zinc are d-block elements but
are not transition metals’.
Discuss this statement, using appropriate electronic configurations to support
your answer.
(4)
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(Total for Question 1 = 8 marks)
Question
Mathematics
Edexcel2020
This question is about transition metals and transition metal complexes.
(a) Describe the bonding in the element chromium and use your answer to justify
why it has such a high melting temperature.
You may find it helpful to draw a labelled diagram.
(4)
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(b) When chromium(III) sulfate dissolves in water, a green solution containing the
[Cr(H O) ]3+ ion forms.
Question
Mathematics
Edexcel2018
This question is about transition metals.
(a) Which of these ions has the electronic configuration [Ar]3d5?
(1)
A Cr3+
B Fe2+
C Mn2+
D Mn3+
(b) In which of these complex ions does the transition metal have the
oxidation number +3?
(1)
A [Ag(CN) ]−