Assertion :- If a liquid solute more volatile than the solvent is added to the solvent, the vapour pressure of the solution may increase i.e., `p_(s)gt p^(@)`.
Reason :- In the presence of a more volatile liquid solute, only the solute will form vapours and solvent will not.

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

Explanation

To analyze the assertion and reason provided in the question, let's break it down step by step.

### Step 1: Understanding the Assertion
The assertion states that if a liquid solute is more volatile than the solvent, the vapor pressure of the solution may increase.

**Explanation**:
- Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase.
- When a more volatile solute is added to a solvent, it can contribute to the total vapor pressure of the solution because it tends to evaporate more readily than the solvent.

### Step 2: Understanding the Reason
The reason given is that in the presence of a more volatile liquid solute, only the solute will form vapors, and the solvent will not.

**Explanation**:
- This statement is incorrect. In reality, both the solute and the solvent can form vapors. However, since the solute is more volatile, it will have a greater tendency to evaporate compared to the solvent. This means that the vapor pressure of the solution can increase due to the contribution of the more volatile solute.

### Step 3: Conclusion
Based on the analysis:
- The assertion is true: the vapor pressure of the solution can indeed increase when a more volatile solute is added.
- The reason is false: both the solute and solvent can form vapors, but the solute will dominate due to its higher volatility.

### Final Answer
Thus, the correct conclusion is that the assertion is true, but the reason is false.

---