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

(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 dissolved in Pt

(d) concentration of H+ ions is larger when Pt electrode is taken