CH-1723

Half-equations

Chemistry · Secondary 4 · Easy · Half-equations

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

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

$Pb^{2+} + 2e^- \rightarrow Pb$
$Pb \rightarrow Pb^{2+} + 2e^-$
$2Br^- \rightarrow Br_2 + 2e^-$
$Br_2 + 2e^- \rightarrow 2Br^-$

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