CH-1715

Electrolysis of solutions

Chemistry · Secondary 4 · Medium · Electrolysis of solutions

Copper(II) sulfate solution is electrolysed using copper electrodes. Which half‑equation occurs at the anode?

$Cu^{2+}(aq) + 2e^- \rightarrow Cu(s)$
$Cu(s) \rightarrow Cu^{2+}(aq) + 2e^-$
$2H_2O(l) \rightarrow O_2(g) + 4H^+(aq) + 4e^-$
$2H^+(aq) + 2e^- \rightarrow H_2(g)$

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