For a redox reaction, $\mathrm{Cd}^{2+}+2 \mathrm{e}^{-} \rightleftharpoons \mathrm{Cd}$, the $\left(\mathrm{E}_{\mathrm{p}}\right)_{\text {anodic }}$ observed in cyclic voltametry at hanging mercury drop electrode is -650 mV vs. SCE. The expected value for $\left(\mathrm{E}_{\mathrm{p}}\right)_{\text {cathodic }}$ is
(a)-708 mV
(b)-679 mV
(c)-650 mV
(d)-621 mV
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.