CH-1714

Electrolysis of solutions

Chemistry · Secondary 4 · Medium · Electrolysis of solutions

During the electrolysis of concentrated aqueous sodium chloride using inert carbon electrodes, which half‑equation correctly represents the reaction at the anode?

$2Cl^-(aq) \rightarrow Cl_2(g) + 2e^-$
$2H_2O(l) + 2e^- \rightarrow H_2(g) + 2OH^-(aq)$
$4OH^-(aq) \rightarrow O_2(g) + 2H_2O(l) + 4e^-$
$Na^+(aq) + e^- \rightarrow Na(s)$

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