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The lowering of vapour pressure of the s...

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

A

the density of the solution increases

B

the surface tension of the solution decreases

C

the molecules of the solvent on the surface are replaced by the molecules of the solute

D

the mole fraction of solvent is less than 1

Text Solution

Verified by Experts

The correct Answer is:
D
Vapour pressure does not depend upon surface area of a volatile liquid `(p)/(p^(@)) = x_("solvent")` In case of a solution `x_("solvent") lt 1`.
`:. p lt p^(@)`.
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