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Q.

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

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a

Na is dissolved in Hg while it does not dissolve in Pt

b

Hg is more inert than Pt

c

Conc. of H+ ions is larger when Pt electrode is taken

d

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

answer is B.

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Detailed Solution

More voltage is required to convert H+1e1/2H2 at Hg than at pt

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