Which one of the following events occurs during the charging of a lead storage battery?

Options

A. Consumption of sulphuric acid
B. Formation of sulphuric acid
C. Formation of lead sulphate
D. Consumption of lead

Explanation

To solve the question, "Which one of the following events occurs during the charging of a lead storage battery?", we will analyze the reactions that take place during the charging process of a lead storage battery.

### Step-by-Step Solution:

1. **Understanding the Lead Storage Battery**:
- A lead storage battery, commonly used in automobiles, consists of several voltaic cells. Each cell contains lead dioxide (PbO2) as the positive plate, sponge lead (Pb) as the negative plate, and a sulfuric acid (H2SO4) electrolyte.

2. **Reactions During Discharge**:
- During discharge, the lead storage battery undergoes the following reactions:
- At the anode (negative plate):
\[ \text{Pb} + \text{SO}_4^{2-} \rightarrow \text{PbSO}_4 + 2e^- \]
- At the cathode (positive plate):
\[ \text{PbO}_2 + \text{SO}_4^{2-} + 4\text{H}^+ + 2e^- \rightarrow \text{PbSO}_4 + 2\text{H}_2\text{O} \]

3. **Reactions During Charging**:
- When charging the battery, the reactions are reversed:
- At the anode:
\[ \text{PbSO}_4 + 2e^- \rightarrow \text{Pb} + \text{SO}_4^{2-} \]
- At the cathode:
\[ \text{PbSO}_4 + 2\text{H}_2\text{O} \rightarrow \text{PbO}_2 + \text{SO}_4^{2-} + 4\text{H}^+ + 2e^- \]

4. **Overall Reaction**:
- The overall reaction during charging can be summarized as:
\[ \text{PbSO}_4 + 2\text{H}_2\text{O} \rightarrow \text{PbO}_2 + \text{Pb} + \text{H}_2\text{SO}_4 \]
- This indicates that sulfuric acid (H2SO4) is formed during the charging process.

5. **Conclusion**:
- Therefore, the event that occurs during the charging of a lead storage battery is the formation of sulfuric acid.

### Final Answer:
- The correct answer is: **Formation of sulfuric acid**.