Assiertion : The vapour pressure of a luquid decreses if some non-volatile solute is dissolved in it.
Reason : The relative lowering of a solution containing a non-volatile solute is equil to the mole fraction of the solute in the solution.

Options

A. If both assertion are reason are correct and reason is correct explanation for assertion.
B. If both assertion and reason are corrct but reason is not correct explanation for assertion.
C. If assertion is corrct but reason is incorrect.
D. If assertion and reason both are incrrect.

Answer

b

Explanation

Correct Explanation : On adding a non- volatile solute the vapour pressure of liquid decreases because the solute particles occupying some surface area of the luquid (solvent) resulting in lowering of vapour pressure.