In a lead-acid storage battery, pbo2 is reduced to

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02-05-2018
Chemistry

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In a lead-acid storage battery, pbo2 is reduced to

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PBCHEM PBCHEM · Answer 1 · 2018-05-09T19:04:36+02:00

Lead-Acid storage battery is a secondary cell which can be recharged by passing current through it in the opposite direction.

Following is the overall chemical reaction operative during discharging of lead-acid battery:
Pb(s) + PbO2(s) + 2H2SO4(aq) → 2PbSO4(s) + 2H2O(l)

From above reaction, it can be seen that oxidation state of lead in PbO2 and PbSO4 is +4 and +2 respectively. Thus, upon discharging lead oxide is reduced to lead sulphate in lead-acid storage battery.