In electrolysis of NaCl, when Pt electrode is taken, H2 is liberated at cathode, while with Hg catho….

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In electrolysis of NaCl, when Pt electrode is taken, H₂ is liberated at cathode, while with Hg cathode, it forms sodium amalgam. Give the correct reason.

Options :-

1. Hg is more inert than Pt.
2. More voltage is required to reduce H⁺ at Hg than at Pt.
3. Na is dissolved in Hg, while it does not dissolve in Pt.
4. Concentration of H⁺ ions is larger when Pt electrode is taken.

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