Question

Which one of the following statements is false?

(a) Raoult’s law states that the vapour pressure of a component over a solution is proportional to its mole fraction.
(b) The osmotic pressure (π) of a solution is given by the equation (π = MRT, where M is the molarity of the solution.
(c) The correct order of osmotic pressure for 0.01M aqueous solution of each compound is BaCl₂ > KCl > CH₃ COOH > sucrose.
(d) Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression.

Answer 1

(d) : The extent of depression in freezing point varies with the number of solute particles for a fixed solvent only and it’s a characteristic feature of the nature of solvent also. ΔT_f = k_f × m
For different solvents, value of k f is also different.
So, for two different solvents the extent of depression may vary even if number of solute particles be dissolved in them.