Chemistry · Dry cell and lead accumulator, fuel cells
As a lead storage battery is charged.
As a lead storage battery is charged.
- A. Lead dioxide dissolves
- B. Sulphuric acid is regenerated
- C. Lead electrode becomes coated with lead sulphate
- D. The concentration of sulphuric acid decreases
Step-by-step solution
During charging of a lead storage battery, the reverse reactions of discharge occur. Lead sulfate (PbSO4) at both electrodes is converted back to lead dioxide (PbO2) at the anode and lead (Pb) at the cathode, releasing sulfate ions into the solution, thereby regenerating sulfuric acid. Thus, the concentration of sulfuric acid increases, not decreases, and lead dioxide is formed rather than dissolved. Hence, option B is correct.
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