Assertion: As a lead storage battery gets discharged, density of electrolyte, present in it, decreases.
Reason: lead and lead dioxide both react with sulphuric acid to form lead sulphate.

Options

A. If both assertion and Reason are true and the Reason is the correct explanation of the assertion.
B. If both assertion and Reason are true but the reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Explanation

To solve the question, we need to analyze the assertion and reason provided regarding the lead storage battery.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that as a lead storage battery gets discharged, the density of the electrolyte decreases.
- In a lead storage battery, the electrolyte is sulfuric acid (H2SO4).

2. **Chemical Reactions During Discharge**:
- When the battery discharges, lead (Pb) and lead dioxide (PbO2) react with the sulfate ions (SO4^2-) from the sulfuric acid.
- The reactions can be summarized as follows:
- **For Lead (Pb)**:
\[ \text{Pb} + \text{SO}_4^{2-} \rightarrow \text{PbSO}_4 + 2e^- \]
- **For Lead Dioxide (PbO2)**:
\[ \text{PbO}_2 + 4\text{H}^+ + \text{SO}_4^{2-} + 2e^- \rightarrow \text{PbSO}_4 + 2\text{H}_2\text{O} \]

3. **Consumption of Sulfuric Acid**:
- From the reactions, we can see that both lead and lead dioxide consume sulfate ions (SO4^2-) from sulfuric acid to form lead sulfate (PbSO4).
- As these sulfate ions are consumed, the concentration of sulfuric acid decreases.

4. **Effect on Density**:
- The density of a solution is related to its concentration. As the concentration of sulfuric acid decreases due to its consumption in the reactions, the overall density of the electrolyte will also decrease.

5. **Evaluating the Reason**:
- The reason states that lead and lead dioxide both react with sulfuric acid to form lead sulfate.
- This statement is true as we have derived from the chemical reactions.

6. **Conclusion**:
- Both the assertion and the reason are true.
- The reason correctly explains the assertion since the consumption of sulfuric acid leads to a decrease in its density.

### Final Answer:
Both assertion and reason are true, and the reason is the correct explanation of the assertion.