DP Chemistry (first assessment 2025)

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Question 21M.1A.HL.TZ2.8

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.HL.TZ2.8
Level	HL	Paper	1A	Time zone	TZ2
Command term	State	Question number	8	Adapted from	N/A

8.

[Maximum mark: 1]

21M.1A.HL.TZ2.8

Which factor does not affect the colour of a complex ion?

A. temperature of the solution

B. identity of the ligand

C. identity of the metal

D. oxidation number of the metal

[1]

Markscheme

A

Syllabus sections

Structure 3. Classification of matter » Structure 3.1—The periodic table: Classification of elements » Structure 3.1.10—Transition element complexes are coloured due to the absorption of light when an electron is promoted between the orbitals in the split d-sublevels. The colour absorbed is complementary to the colour observed. Apply the colour wheel to deduce the wavelengths and frequencies of light absorbed and/or observed.