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Which of the following is classified as a secondary (rechargeable) cell?
ALead-storage battery
BDry cell (Leclanche)
CMercury button cell
DAlkaline cell
Answer & Solution
Correct answer: A. Lead-storage battery
Primary cells (dry, mercury, alkaline) undergo irreversible chemical changes during discharge and cannot be reliably recharged. The lead-acid (lead-storage) battery used in automobiles is a secondary cell because the discharge reaction at the electrodes can be reversed by passing current in the opposite direction, regenerating $\mathrm{Pb}$ and $\mathrm{PbO_2}$ from $\mathrm{PbSO_4}$.
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