Which of the following half-reaction belongs to a secondary cell ?

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Pb + SO4-2→PbSO4 + 2e-

MnO2 + NH4+ + e- → MnO(OH)

HgO + H2O + 2e- →Hg + 2 OH-

Zn + 2 OH-→ZnO + H2O + 2e-

answer is A.

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Detailed Solution

2,3,4 belongs to primary cells

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