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Which of the following is the reaction half- reaction for a storage battery ?
A. `PbO_(2 (s)) + SO_(4)^(2-) + 4 H^(+) + 2e^(-) to PbSO_(4 (s)) + 2 H_(2)O`
B. `Pb_((s)) + PbO_(2 (s)) + 2 H_(2)SO_(4) to 2 Pb SO_(4 (s)) + 2 H_(2)O`
C. `Pb_((s)) + H_(2)SO_(4) to PbSO_(4 (s)) + 2 H^(+) + 2e^(-)`
D. `2 PbSO_(4 (s)) + 2 H_(2)O to Pb_((s)) + PbO_(2(s)) + 2 H_(2)SO_(4)`

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Correct Answer - A
Reduction half- cell reaction .
`PbO_(2 (S)) + 4H^(+) + SO_(4)^(2-) +2 e^(-) to PbSO_(4 (S)) + 2 H_(2)O`
Oxidation half -cell reaction .
`Pb_((S)) + SO_(4)^(2-) + 2 e^(-)`

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