Answer :
Pb has the oxidation state of +4 in PbO2 and it reduces to PbSO4 where oxidation state is +2. Thus, 2 electrons (+4 - +2) electrons are required for this reduction reaction to take place.
Since 2 electrons are accepted are used up in this reduction process, so by Faraday’s law of electrolysis,
1 mole of Pb requires 2F electricity to carry out the reduction.
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