Question

The vapour pressure (V.P.) of a dilute solution of non-volatile solute is P and the V.P. of pure solvent is $P^0$, the lowering of the V.P. is :

• A. $+ve$
• B. $-ve$
• C. $P/P^0$
• D. $P^0/P$

Answer 1

The correct option is A $+ve$

The vapour pressure (V.P.) of a dilute solution of non-volatile solute is P and the V.P. of pure solvent is $P_0$, the lowering of the V.P. is +ve.Lowering of vapor pressure is always positive.