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Assertion : Vapour pressure of solvent i...

Assertion : Vapour pressure of solvent increases when solvent B is added.
Reason : B is more volatile therefor vapour pressure of B is greater than of A.

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Vapour pressure of a solvent containing nonvolatile solute is:

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

Each question contains STATEMENT-I(Assertion) and STATEMENT-2(Reason).the statement carefully and mark the correct answer accoring to the instrution given below: STATEMENT - 1 : if a liquid solute more volatile than the solvent is added to the solvent, the vapour pressure of the solution is greater than vapour pressure of pure solvent. STATEMENT - 2 : Vapour pressure of solution is eqeal to vapour pressure of sovent.

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

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