Discussion
The electrolyte used in lead storage battery is
Answer: C
The electrolyte is 38% H2SO4 aqueous solution.
A lead storage battery has a lead anode and a lead dioxide cathode dipped in sulphuric acid of about 38% by mass (density about 1.3 g mL-1). During discharge both electrodes turn to PbSO4 and the acid is used up, which is why its density is a measure of the state of charge.
Hydrochloric acid is not used, because PbCl2 would form and the cell reactions depend on the sulphate. 10% acid is too dilute and 60% too concentrated for the standard cell.
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