Why vapour pressure of a liquid decreases when a non`-` volatile solute is added to it ?

Explanation

To understand why the vapor pressure of a liquid decreases when a non-volatile solute is added, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Definition of Vapor Pressure**:
- Vapor pressure is the pressure exerted by the vapor in equilibrium with its liquid at a given temperature. It reflects the tendency of particles to escape from the liquid phase into the vapor phase.

2. **Introduction of Non-Volatile Solute**:
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