O-LevelChemistryElectrolysis5070/11 · Oct/Nov 2023 · Q121 Mark

Aqueous copper(II) sulfate is electrolysed with copper electrodes. What is the equation for the reaction occurring at the anode?

ACu → Cu2+ + 2e-

BCu2+ + 2e¯ → Cu

C4OH¯ → O2 + 2H2O + 4e¯

D2SO4^2- + 2H2O → 2H2SO4 + O2 + 4e¯

✓ Correct answer

A: Cu → Cu2+ + 2e-

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 1, question 12.

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