Give two points to explain why vapour pressure of solvent is lowered by dissolving nonvolatile solute into it.

If P^(@) the vapour pressure of a pure solvent and P is the vapour pressure of the solution prepared by dissolving a non volatile solute in it. The mole fraction of the solvent X_(A) is given by:

Explain with vapour pressure-temperature curves that the freezing point of a solvent is lowered by dissolving a nonvolatile solute into it. Give reason for such lowering of freezing of solvent

The lowering of vapour pressure of the solvent takes place on dissolving a non-volatile solute because

Vapour pressure of a solvent containing nonvolatile solute is:

How is the vapour pressure of a solvent affected when a non volatile solute is dissolved in it?