Question:
in electrolysis of nacl when pt electrode is taken then H2 is liberated at cathode while with hg cathode it forms sodium amalgam because [cbse aipmt 2002]
Answer:
Hi,
If mercury is used as a cathode, H+ ions are not discharged at mercury cathode because mercury has high hydrogen overvoltage.
Na+ ions are discharged at the cathode in preference of H+ ions yielding sodium, which dissolves in mercury to form sodium amalgam.
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