A) increases the vapour pressure of the solvent
B) decreases the vapour pressure of the solvent
C) decreases the boiling pomt of the solvent
D) increases the freezing point of the solvent
Correct Answer: B
Solution :
Addition of a non-volatile solute in a volatile ideal solvent decreases the vapour pressure of the solvent because if a non-volatile solute is added to the solvent temperature falls (since dissolution of a solute is an endothermic process) and thus, vapour pressure of the solution is lower than that of the pure solvent.
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