STATEMENT-1 : Relative lowering of vapour pressure is equal to mole fraction of the solute.
and
STATEMENT-2 : Relative lowering of vapour pressure is a colligative property.

Options

A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-2
B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-2
C. Statement-1 is True, Statement-2 is False
D. Statement-1 is False, Statement-2 is True

Answer

To solve the question, we need to analyze both statements provided and determine their validity.

### Step 1: Understand Statement 1
**Statement 1:** Relative lowering of vapor pressure is equal to mole fraction of the solute.

- The relative lowering of vapor pressure can be defined mathematically as:
\[ \text{Relative lowering of vapor pressure} = \frac{P_0 - P_1}{P_0} \]
where \( P_0 \) is the vapor pressure of the pure solvent and \( P_1 \) is the vapor pressure of the solvent when a solute is added.

- According to Raoult's Law, the relative lowering of vapor pressure is also equal to the mole fraction of the solute (\( X_B \)):
\[ \frac{P_0 - P_1}{P_0} = X_B \]

- Therefore, Statement 1 is **true**.

### Step 2: Understand Statement 2
**Statement 2:** Relative lowering of vapor pressure is a colligative property.

- Colligative properties are properties that depend on the number of solute particles in a solution, not on their identity. Examples include boiling point elevation, freezing point depression, and vapor pressure lowering.

- Since the relative lowering of vapor pressure depends on the number of solute particles, it is classified as a colligative property.

- Therefore, Statement 2 is also **true**.

### Step 3: Determine the Relationship Between the Statements
- Both statements are true, but we need to evaluate whether Statement 2 provides a correct explanation for Statement 1.

- While Statement 2 is true, it does not explain why the relative lowering of vapor pressure equals the mole fraction of the solute. The explanation lies in Raoult's Law, which is not mentioned in Statement 2.

### Conclusion
- Both statements are true, but Statement 2 is not the correct explanation for Statement 1.

### Final Answer
The correct option is: **Both statements are true, but Statement 2 is not the correct explanation for Statement 1.**

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