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In electrolysis of NaCl when Pt electrode is taken then H₂ is liberated at cathode

In electrolysis of NaCl when Pt electrode is taken then H₂ is liberated at cathode while with Hg cathode it forms sodium amalgam

Options

(a) Hg is more inert than Pt
(b) More voltage is required to reduce H⁺ at Hg than at Pt
(c) Na is dissolved in Hg while it does not dissolve in Pt
(d) Conc. of H⁺ ions is larger when Pt electrode is taken

Correct Answer:

More voltage is required to reduce H⁺ at Hg than at Pt

Explanation:

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