O-LevelChemistryElectrolysis5070/11 · May/June 2012 · Q151 Mark

Aqueous copper(II) sulfate is electrolysed using copper electrodes. Which equation represents the reaction taking place at the anode (positive electrode) in this electrolysis?

ACu(s) → Cu²+(aq) + 2e¯

BSO42-(aq) → SO2(g) + O2(g) + 2e

CCu²+(aq) + 2e¯ → Cu(s)

D4OH¯(aq) → 2H2O(l) + O2(g) + 4e¯

✓ Correct answer

A: Cu(s) → Cu²+(aq) + 2e¯

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2012 Paper 1 Variant 1, question 15.

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