IB Chemistry HL S3.1 The periodic table: classification of elements questions

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Question 1

Paper 2Hard8 marks

Cobalt(II) occurs in differently coloured complexes. A student records the appearance and wavelength of maximum absorption for two solutions.

Complex in solutionAppearanceWavelength of maximum absorption / nm
[Co(H₂O)₆]²⁺pink535
[CoCl₄]²⁻ in chloride-rich solutionblue610
(a)

State what happens to an electron when visible light is absorbed by a transition-element complex.

[1]
(b)

Use the colour wheel in the data booklet to identify the colour of light absorbed by each solution.

[2]
(c)

A student argues: “Because the solution looks blue, its complex absorbs higher-frequency light than the pink solution.” Assess this claim quantitatively, using the data.

[5]

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