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Question

Which of the following reactions occurs at cathode during charging of storage battery?

A
Pb2++2ePb
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B
PbPb2++2e
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C
Pb2++SO24PbSO4
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D
PbSO4+2H2OPbO2+4H++SO22+2e
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Solution

The correct option is A Pb2++2ePb
(i) Cell reaction during discharge at anode:-
Oxidation reaction at anode[negative electrode]:-
Pb(s)Pb2+(aq)+2e---------[oxidation reaction].
Pb2+(aq)+SO24(aq)PbSO4(s).
Final Reaction:- Pb(s)+SO24(aq)PbSO4(s)+2e [overall oxidation at anode].

(ii) Cell reaction during recharge:-
The reverse of oxidation at anode during discharge is the reduction reaction at cathode during recharging.
Pb2+(aq)+2ePb(s)---------[reduction].
PbSO4(s)Pb2+(aq)+SO24(aq)
Final Reaction:- PbSO4(s)+2ePb(s)+SO24(aq)


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