Choose the correct statement:
When concentration of a salt solution is increased.

Options

A. Boiling point increases while vapour pressure decreases
B. Boiling point decreases while vapour pressure increases
C. Freezing point decreases while vapour pressure increases
D. Freezing point increases while vapour pressure decreases

Explanation

To solve the question regarding the effect of increasing the concentration of a salt solution, we can analyze the properties of solutions, particularly focusing on vapor pressure, boiling point, and freezing point.

### Step-by-Step Solution:

1. **Understanding Vapor Pressure**:
- Vapor pressure is the pressure exerted by vapor in equilibrium with its liquid phase. It depends on the number of solvent molecules escaping into the vapor phase.
- When a solute (like salt) is added to a solvent, the number of solvent molecules at the surface decreases because some of the surface area is occupied by solute particles.

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