What a lead stroange is discharged:-

Options

A. `PbSO_(4)` is formed
B. `Pb` is fomed
C. `SO_(2)` is consumed
D. `H_(2)SO_(4)` is consumed

Answer

To solve the question regarding the discharge of a lead storage battery, we will analyze the chemical processes that occur during the discharge phase of the battery.

### Step-by-Step Solution:

1. **Understanding the Lead Storage Battery**:
- A lead storage battery is a type of secondary cell that can be recharged. It operates through redox reactions, where chemical energy is converted into electrical energy during discharge.

2. **Reactions During Discharge**:
- When the lead storage battery discharges, the following reactions occur:
- At the anode (negative electrode):
\[ \text{Pb (s)} + \text{SO}_4^{2-} \text{(aq)} \rightarrow \text{PbSO}_4 \text{(s)} + 2 \text{e}^- \]
This reaction shows that solid lead (Pb) is oxidized to lead sulfate (PbSO4), releasing electrons.

- At the cathode (positive electrode):
\[ \text{PbO}_2 \text{(s)} + 4 \text{H}^+ \text{(aq)} + \text{SO}_4^{2-} \text{(aq)} + 2 \text{e}^- \rightarrow \text{PbSO}_4 \text{(s)} + 2 \text{H}_2\text{O (l)} \]
This reaction indicates that lead dioxide (PbO2) is reduced to lead sulfate (PbSO4) and water (H2O) while consuming electrons.

3. **Overall Reaction**:
- Combining the two half-reactions gives the overall reaction during discharge:
\[ \text{Pb (s)} + \text{PbO}_2 \text{(s)} + 2 \text{H}_2\text{SO}_4 \text{(aq)} \rightarrow 2 \text{PbSO}_4 \text{(s)} + 2 \text{H}_2\text{O (l)} \]

4. **Analyzing the Options**:
- **Option 1**: PbSO4 is formed. **(Correct)**
- The overall reaction shows that lead sulfate (PbSO4) is indeed formed.
- **Option 2**: Pb is formed. **(Incorrect)**
- Lead (Pb) is consumed in the reaction, not formed.
- **Option 3**: SO2 is consumed. **(Incorrect)**
- There is no involvement of sulfur dioxide (SO2) in the discharge process.
- **Option 4**: H2SO4 is consumed. **(Correct)**
- The overall reaction indicates that sulfuric acid (H2SO4) is consumed during the discharge.

5. **Conclusion**:
- The correct answers to the question are:
- **Option 1**: PbSO4 is formed.
- **Option 4**: H2SO4 is consumed.