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An Intiative by Sri Chaitanya
a
MnO2+NH4++e-→MnO(OH)+NH3 . . . Cathodic reaction in dry cell
b
Zn-Hg+2OH-→ZnO+H2O+Hg+2e- . . . Anodic reaction in mercury cell
c
Pb+SO4-2→PbSO4+2e- . . . Anodic reaction in lead storage battery during dischage
d
2H2O+2e-→H2+4OH- . . . Cathodic reaction in H2-O2 fuel cell
answer is D.
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