Which of the following reactions occurs at the anode during the recharging of lead storage battery ?

Options

A. `Pb+SO_(4)^(2-) rarr PbSO_(4)+2e^(-)`
B. `Pb+PbO_(2)+H_(2)SO_(4) rarr 2PbSO_(4)+2H_(2)O`
C. `PbSO_(4)+2e^(-) rarr Pb+SO_(4)^(2-)`
D. `PbSO_(4)+2H_(2)O rarrPb+PbO_(2)+2H_(2)SO_(4)+2e^(-)`

Explanation

To determine which reaction occurs at the anode during the recharging of a lead storage battery, we need to analyze the processes involved in the recharging phase.

### Step-by-Step Solution:

1. **Understanding the Lead Storage Battery**:
- A lead storage battery consists of lead (Pb), lead dioxide (PbO2), and sulfuric acid (H2SO4). During discharge, the battery converts chemical energy into electrical energy.

2. **Identifying the Anode Reaction**:
- During recharging, the process is reversed. At the anode, oxidation occurs, which means that a substance loses electrons.

3. **Oxidation Reaction at the Anode**:
- The primary reaction at the anode during the recharging of a lead storage battery involves lead sulfate (PbSO4) reacting with water (H2O). The reaction can be represented as:
\[ \text{PbSO}_4 + 2 \text{H}_2\text{O} \rightarrow \text{PbO}_2 + 4 \text{H}^+ + \text{SO}_4^{2-} + 2 \text{e}^- \]
- In this reaction, lead sulfate (PbSO4) is oxidized to lead dioxide (PbO2), and it releases electrons.

4. **Net Reaction During Recharging**:
- The overall reaction during the recharging of the battery can be summarized as:
\[ 2 \text{PbSO}_4 + 2 \text{H}_2\text{O} \rightarrow \text{Pb} + \text{PbO}_2 + 2 \text{H}_2\text{SO}_4 \]
- This shows that lead sulfate is converted back into lead and lead dioxide, along with sulfuric acid.

5. **Conclusion**:
- Therefore, the correct reaction that occurs at the anode during the recharging of a lead storage battery is the oxidation of lead sulfate to lead dioxide, along with the release of electrons.

### Final Answer:
The reaction at the anode during the recharging of a lead storage battery is:
\[ \text{PbSO}_4 + 2 \text{H}_2\text{O} \rightarrow \text{PbO}_2 + 4 \text{H}^+ + \text{SO}_4^{2-} + 2 \text{e}^- \]