Which of the following solution has maximum vapour pressure :-

Options

A. 1 N `KNO_(3)`
B. 1 N `Ba(NO_(3))_(2)`
C. 1 N `Al_(2)(SO_(4))_(3)`
D. 1 N `Ti(NO_(3))_(4)`

Answer

To determine which solution has the maximum vapor pressure, we need to analyze the dissociation of each compound in the solution. The vapor pressure of a solution is influenced by the number of solute particles in the solution. The more particles that are present, the lower the vapor pressure due to the colligative properties of solutions.

### Step-by-Step Solution:

1. **Identify the Solutions**:
We have four solutions to analyze. Let's denote them as:
- A: KNO3
- B: Ba(NO3)2
- C: Al2(SO4)3
- D: Ti(NO3)4

2. **Determine the Dissociation of Each Compound**:
- **KNO3** dissociates into:
\[ KNO3 \rightarrow K^+ + NO3^- \]
This results in **2 particles**.

- **Ba(NO3)2** dissociates into:
\[ Ba(NO3)2 \rightarrow Ba^{2+} + 2NO3^- \]
This results in **3 particles**.

- **Al2(SO4)3** dissociates into:
\[ Al2(SO4)3 \rightarrow 2Al^{3+} + 3SO4^{2-} \]
This results in **5 particles**.

- **Ti(NO3)4** dissociates into:
\[ Ti(NO3)4 \rightarrow Ti^{4+} + 4NO3^- \]
This results in **5 particles**.

3. **Compare the Number of Particles**:
- KNO3: 2 particles
- Ba(NO3)2: 3 particles
- Al2(SO4)3: 5 particles
- Ti(NO3)4: 5 particles

4. **Determine the Maximum Vapor Pressure**:
The vapor pressure is inversely related to the number of solute particles. Therefore, the solution with the least number of particles will have the highest vapor pressure.

Since both Al2(SO4)3 and Ti(NO3)4 dissociate into 5 particles, we need to consider their nature:
- Al2(SO4)3 is a more ionic compound and will dissociate more completely in solution compared to Ti(NO3)4.

5. **Conclusion**:
Therefore, the solution with the maximum vapor pressure is **Al2(SO4)3**.

### Final Answer:
The solution with maximum vapor pressure is **Al2(SO4)3**.