DP Chemistry (last assessment 2024)

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Question 18M.3.hl.TZ2.18b.i

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.3.hl.TZ2.18b.i
Level hl Paper 3 Time zone TZ2
Command term State Question number b.i Adapted from N/A
b.i.
[Maximum mark: 1]
18M.3.hl.TZ2.18b.i

The conductivity of a germanium semiconductor can be increased by doping.

A dye-sensitized solar cell uses a ruthenium(II)–polypyridine complex as the dye. Two ruthenium(II) complexes, A and B, absorb light of wavelengths 665 nm and 675 nm respectively.

(b.i)

State the feature of the molecules responsible for the absorption of light.

[1]

Markscheme

conjugated C=C/carbon–carbon double bonds

OR

«multiple» alternating C=C/carbon–carbon double bonds

OR

«extensive electron» conjugation/delocalization

OR

«many» fused/conjugated aromatic/benzene rings

[1 mark]

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