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Q.

In Castner Kellner cell, reaction at mercury cathode is

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a

2H2O + 2e-  H2 + 2OH-

b

2Cl- Cl2 + 2e-

c

Na++ OH- NaOH

d

Na+ + e- + Hg NaHg

answer is D.

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Detailed Solution

At cathode: Na + e- + Hg → NaHgsodium amalgum
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