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When a lead storage battery is discharged;
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sulphuric acid is consumed
$\mathrm{H}_2 \mathrm{SO}_4$ is consumed during discharging of lead storage battery as, Pb changes to $\mathrm{PbSO}_4$, and $\mathrm{PbO}_2$ changes to $\mathrm{PbSO}_4$.
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