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, we need to evaluate each of the three statements regarding colligative properties and vapor pressure.

### Step-by-Step Solution:

1. **Evaluate Statement 1: "Colligative properties do not depend upon the nature of solute."**
- Colligative properties are properties that depend on the number of solute particles in a solution, not on the type of particles. Examples include boiling point elevation, freezing point depression, vapor pressure lowering, and osmotic pressure. Therefore, this statement is **correct**.

2. **Evaluate Statement 2: "A plot of partial vapor pressure against mole fraction will be linear."**
- According to Raoult's Law, the partial vapor pressure of a component in a solution is directly proportional to its mole fraction in the solution. This means that if we plot the partial vapor pressure against the mole fraction, we will obtain a straight line. Thus, this statement is also **correct**.

3. **Evaluate Statement 3: "Vapor pressure of solution increases on account of hydrogen bonding."**
- Hydrogen bonding is a strong intermolecular force that typically decreases the vapor pressure of a solution because it makes it harder for molecules to escape into the vapor phase. Therefore, this statement is **incorrect**.

### Conclusion:
- Based on the evaluations:
- Statement 1: Correct
- Statement 2: Correct
- Statement 3: Incorrect

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

### Final Answer:
The correct answer is: **1 and 2 are correct.**