Discussion
Hydrogen's high overvoltage on a mercury cathode allows
Answer: C
Correct answer: sodium to be deposited from aqueous solution
Hydrogen has an overvoltage of nearly a volt on mercury, so its discharge is suppressed and sodium is deposited instead, dissolving into the mercury as an amalgam - which is exactly how the mercury cell in the chlor-alkali industry works. Without that overvoltage, hydrogen would be liberated preferentially and no sodium would be obtained from an aqueous solution at all.
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