Which of the following statement are correct ?
1. Colligative properties do not depend upon the nature of solute
2. A plot of partial vapour pressure against mole fraction will be linear
3. Vapour pressure of solution increases on account of hydrogen bonding
Select the correct answer using the codes given below

Options

A. 1 and 2
B. 1 ,2 and 3
C. 2 and 3
D. 1 and 3

Answer

To solve the question regarding the correctness of the given statements about colligative properties and vapor pressure, we will analyze each statement step by step.

### Step 1: Analyze Statement 1
**Statement 1:** Colligative properties do not depend upon the nature of solute.

**Explanation:**
Colligative properties are properties that depend on the number of solute particles in a solution, rather than the identity of those particles. Examples include boiling point elevation, freezing point depression, vapor pressure lowering, and osmotic pressure. Since these properties rely solely on the quantity of solute particles, this statement is **correct**.

### Step 2: Analyze Statement 2
**Statement 2:** A plot of partial vapor pressure against mole fraction will be linear.

**Explanation:**
According to Raoult's Law, the partial vapor pressure of a component in a solution is directly proportional to its mole fraction. Mathematically, this can be expressed as:
\[ P_A = X_A \cdot P^0_A \]
where \( P_A \) is the partial vapor pressure, \( X_A \) is the mole fraction, and \( P^0_A \) is the vapor pressure of the pure component. Since this relationship is linear, the plot of partial vapor pressure against mole fraction will indeed be a straight line. Therefore, this statement is also **correct**.

### Step 3: Analyze Statement 3
**Statement 3:** Vapor pressure of solution increases on account of hydrogen bonding.

**Explanation:**
Hydrogen bonding generally leads to stronger intermolecular forces, which results in a lower vapor pressure because more energy is required to break these bonds for vaporization. Thus, as hydrogen bonding increases, the vapor pressure of the solution decreases, not increases. Therefore, this statement is **incorrect**.

### Conclusion
Based on the analysis:
- Statement 1 is correct.
- Statement 2 is correct.
- Statement 3 is incorrect.

Thus, the correct answer is that statements 1 and 2 are correct.

### Final Answer
The correct statements are: 1 and 2.