Q.

Vapour pressure is influenced by many factors. Raoult's law relates vapour pressure of a liquid with its mole fraction in the solution. False statement among the following is

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a

Relative lowering of vapour pressure of a solution of non-volatile solute is equal to mole fraction of solute in the solution.

b

Lowering of vapour pressure of solution of non-volatile solute is directly proportional to mole fraction of solute in the solution.

c

Vapour pressure of solution of non-volatile solute is directly proportional to mole fraction of solvent in the solution.

d

Relative lowering of vapour pressure of a solution of non-volatile solute increses with  increase in temperature.

answer is D.

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Detailed Solution

(1) p0-pp0 = X2−   Raoult's  LawWhere X2 = M.F of solute(2)p0−pp0 = X2 p0−p  =  p0 X2 ∴     p0−p  ∝    X2(2) is correct.(3)pS=  p0 X1 pS  α   X1 (3) is correct.(4) RLVP is equal to X2  , independent of temperature
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