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

Options

A. `Pb to Pb^(2+)`
B. `Pb^(4+) to Pb`
C. `Pb^(2+) to Pb`
D. `Pb^(4+) to Pb^(2+)`

Answer

D

Explanation

In lead accumulator reduction reaction is
`underset(O.N.=+4)underset(darr)(PbO_(2)(s)) + 4H^(+)(aq) + SO_(4)^(2-)(aq) to underset(O.N.=+2)underset(darr)(PbSO_(4)(s)) + 2H_(2)O(l)`