CH-1702

Electrolysis of molten compounds

Chemistry · Secondary 4 · Easy · Electrolysis of molten compounds

A student electrolyses molten lead(II) bromide using inert electrodes.

Which half‑equation correctly represents the reaction at the cathode?

$\text{Pb}^{2+} \rightarrow \text{Pb} + 2e^-$
$\text{Pb}^{2+} + 2e^- \rightarrow \text{Pb}$
$2\text{Br}^- \rightarrow \text{Br}_2 + 2e^-$
$\text{Br}_2 + 2e^- \rightarrow 2\text{Br}^-$

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