In this type of questions, a statement of assertion 
is followed by a statement of reason
(R). Mark the correct choice as :
Assertion : The pressure exerted by a liquid at a given temperature is called its vapour pressure.
Reason : If a non-volatile solute is added to a solvent to form a solution, the vapour pressure of the solution is found to be greater than the vapour pressure of the pure solvent.
Text Solution
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The vapour pressure of solution is found to be lower than the vapour pressure of pure solvent. In the solution, the surface has both solute and solvent molecules, thereby the number of solvent molecules gets reduced at the surface, consequently, the number of solvent molecules escaping from the surface is correspondingly reduced and this results in the decrease of vapour pressure of the solvent.
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