Regarding batteries, some reactions are given below. The false combination is

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MnO2+NH4++e-→MnO(OH)+NH3 . . . Cathodic reaction in dry cell

Zn-Hg+2OH-→ZnO+H2O+Hg+2e- . . . Anodic reaction in mercury cell

Pb+SO4-2→PbSO4+2e- . . . Anodic reaction in lead storage battery during dischage

2H2O+2e-→H2+4OH- . . . Cathodic reaction in H2-O2 fuel cell

answer is D.

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Detailed Solution

In H2-O2 fuel cell At cathode : O2+2H2O+2e-→4OH-

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