What is cathodic reaction occurring in the commonly used mercury cell ?

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Zn(Hg)+2OH−⟶ZnO(s)+H2O+2e−

HgO+H2O+2e−⟶Hg(l)+2OH−

Zn+2OH−⟶ZnO(s)+H2O+2e−

Zn(Hg)+HgO(s)⟶ZnO(s)+Hg(l)

answer is B.

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Detailed Solution

Anode Zn(Hg)+2OH−(aq)⟶ZnO(s)+H2O+2e− Cathode HgO(s)+H2O+2e−−⟶Hg(l)+2OH−The Overall reaction is Zn(Hg)+HgO(s)⟶ZnO(s)+Hg(l)

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