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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