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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 $$Pb^{2+} + 2e^{-} \rightarrow Pb$$
(i) Cell reaction during discharge at anode:-
$$\rightarrow$$ Oxidation reaction at anode[negative electrode]:-
$$Pb_{(s)}\rightarrow\,Pb_{(aq)}^{2+}+2e^{-}$$---------[oxidation reaction].
$$Pb_{(aq)}^{2+}+SO_{4(aq)}^{2-}\rightarrow\,PbSO_{4(s)}$$.
Final Reaction:- $$Pb_{(s)}+SO_{4(aq)}^{2-}\rightarrow\,PbSO_{4(s)}+2e^{-}$$ [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.
$$Pb_{(aq)}^{2+}+2e^{-}\rightarrow\,Pb_{(s)}$$---------[reduction].
$$PbSO_{4(s)}\rightarrow\,Pb_{(aq)}^{2+}+SO_{4(aq)}^{2-}$$
Final Reaction:- $$PbSO_{4(s)}+2e^{-}\rightarrow\,Pb_{(s)}+SO_{4(aq)}^{2-}$$


Chemistry

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