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Question
Write the cell reaction of a lead storage battery when it is discharged. How does the density of the electrolyte change when the battery is discharged?
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Solution
\[\ce{Pb + PbO2 + 2H2SO4 ->[Discharge] 2PbSO4 + 2H2O}\]
Density of electrolyte decreases because water is formed and sulphuric acid consumed as the product during discharge of the battery.
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