1.

Why is the V.P. iof solvent decreases when non-volatile solute is added to solvent ? 

Answer»

The decrease in V.P. of the solvent is explained on the basis of surface area of liquid from which evaporation occurs. When non-volatile solute is added a part of the solvent surface is occupied by solute particles which are non-volatile. Therefore, the evaporation of the solvent takes place from lesser surface area and hence V.P. of the solvent decreases.



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