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(D) In a lead storage battery (lead accumulator),the positive electrode is made of $PbO_2$.
During discharge (when used as a source of electrical ene

Vedclass · Accepted Answer

$Pb^{4+} \rightarrow Pb^{2+}$

Vedclass · Answer

(D) In a lead storage battery (lead accumulator),the positive electrode is made of $PbO_2$.
During discharge (when used as a source of electrical energy),the reduction reaction at the positive electrode is:
$PbO_{2	ext{(s)}} + 4H^{+}{_{	ext{(aq)}}} + SO_4^{2-}{_{	ext{(aq)}}} + 2e^{-} ightarrow PbSO_{4	ext{(s)}} + 2H_2O_{	ext{(l)}}$
In this reaction,the oxidation state of lead changes from $+4$ in $PbO_2$ to $+2$ in $PbSO_4$.
Therefore,the reduction process is represented by $Pb^{4+} ightarrow Pb^{2+}$.

Which among the following equations represents the reduction taking place in a lead accumulator at the positive electrode,while it is being used as a source of electrical energy?

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