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Explain the process of recharging of lead storage battery. |
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Answer» Solution :During recharge PROCESS, the role of ANODE and cathode is reversed and `H_(2)SO_(4)` is regenerated. OXIDATION OCCURS at the cathode (now act as anode) `overset(+2)(Pb)SO_(4(s))+2H_(2)O(l) rarr overset(+4)(Pb)O_(2(s))+4H_((aq))^(+)+SO_(4)^(2-)(a)+2e^(-)` Reduction occurs at the anode (now act as cathode) `PbSO_(4(s))+2e^(-) rarr Pb_((s))+SO_(4(aq))^(2-)` Overall reaction : `2PbSO_(4(s))+2H_(2)O(l) rarr Pb_((s))+PbO_(2(s))+4H_((aq))^(+)+2SO_(4(aq))^(2-)` Thus, the overall cell reaction is exactly the reverse of the redox reaction which takes place while discharging. |
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