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As a lead storage battery is charged.

1. Lead dioxide dissolves
2. Sulphuric acid is regenerated
3. Lead electrode becomes coated with lead sulphate
4. The concentration of sulphuric acid decreases

Correct answer: Sulphuric acid is regenerated

Solution

When a lead-acid battery is charged, the chemical changes of discharge are reversed. Lead sulphate is converted back to lead and lead dioxide, and sulphuric acid is formed again in the electrolyte.

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