A-LevelChemistryElectrochemistry9701/12 · Oct/Nov 2023 · Q131 Mark

The equation for the reaction between aqueous copper ions and aqueous iodide ions is as follows. 2Cu²⁺(aq) + 4I⁻(aq) → 2CuI(s) + I2(aq) What is the change in oxidation state of copper?

A+2 to -1

B+2 to 0

C+2 to +1

D+4 to +2

✓ Correct answer

C: +2 to +1

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Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 2, question 13.

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