1.

Which among the followingequations represents the reductionreaction taking place in lead accumulatorat positiveelectrode,while it isbeingused as asource of electrical energy ?

Answer»

`Pb RARR Pb^(2+)`
`Pb^(4+) rarr Pb`
`Pb^(2+) rarr Pb`
`Pb^(4+) rarr Pb^(2+)`

Solution :The reactioninvolved for leadaccumulator duringdischarging i.e, when cell is in theuse are
At anode : `Pb(s) + HSO_(4)^(-)(AQ) rarr PbSO_(4)(s) + H^(+) + 2E^(-)`
At cathode : `PbO_(2)(s)+ 3H^(+) +HSO_(4)^(-)(aq)`
`+2e^(-) rarr PbSO_4(s) + 2H_(2)O(l)`
OVERALL REACTION : `Pb(s) +PbO_(2)(s) + 2H^(+)`
`+2HSO_(4)^(-)(aq) rarr 2PbSO_(4)(s) + 2H_(2)O(l)`


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