O-LevelChemistryElectrolysis5070/11 · May/June 2018 · Q71 Mark
In the electrolysis of CuSO₄(aq), what is the ionic equation for the reaction at the cathode?
ACu + 2e⁻ → Cu²⁺
BCu²⁺ + 2e⁻ → Cu
C2H₂O + Cu²⁺ + 2e⁻ → Cu(OH)₂ + O₂
DSO₄²⁻ + 4H⁺ + 2e⁻ → H₂SO₄ + H₂
✓ Correct answer
B: Cu²⁺ + 2e⁻ → Cu
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