Assertion : `Pb_(2)O_(4)` react with `HNO_(2)` and form `PbO_(2)`
Reason: Lead is stable in +4 oxidation state.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of 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 both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that `Pb2O4` reacts with `HNO2` (nitrous acid) to form `PbO2` (lead dioxide).
- We need to verify if this reaction occurs.

2. **Chemical Reaction**:
- The chemical reaction can be represented as:
\[ Pb_2O_4 + 4HNO_2 \rightarrow 2PbO_2 + 2H_2O + 2Pb(NO_3)_2 \]
- This shows that `Pb2O4` does indeed react with `HNO2` to produce `PbO2`, confirming that the assertion is correct.

3. **Understanding the Reason**:
- The reason states that lead is stable in the +4 oxidation state.
- Lead (Pb) can exhibit oxidation states of +2 and +4. However, due to the inert pair effect, the +2 oxidation state is more stable for lead in many compounds.

4. **Evaluating the Reason**:
- While lead can exist in the +4 state, it is not the most stable state. The +2 state is more stable due to the inert pair effect, which suggests that the outermost s-electrons are less available for bonding.
- Therefore, the reason provided is incorrect.

5. **Conclusion**:
- The assertion is true, but the reason is false. Thus, the correct answer is that the assertion is true and the reason is false.

### Final Answer:
- Assertion: True
- Reason: False