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Assertion : The vapour pressure of a liquid decreases if some non volatile solute is dissolved in it.
Reason : The relative lowering of vapour pressure of a solution containing a nonvolatile solute is equal to the mole fraction of the solute in the solution.
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Reason : The relative lowering of vapour pressure of a solution containing a nonvolatile solute is equal to the mole fraction of the solute in the solution.
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The correct answer is:
If both assertion and reason are true but reason is not the correct explanation of assertion.
On adding a non volatile solute in a liquid the vapour pressure decreases because some molecules of the solvent on the surface are replaced by the molecules of the solute.
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