Question

Which one of the following statements is false?

Options

• Raoult’s law states that the vapour pressure of a component over a solution is proportional to its mole fraction.

• The osmotic pressure (π) of a solution is given by the equation π = MRT, where M is the molarity of the solution.

• The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is BaCl₂ > KCl > CH₃COOH > sucrose.

• Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression.

Answer 1

Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression.

Explanation:

Freezing point depression is given by

ΔT_f = i ⋅ K_f ⋅ m

Where:

i = 1 for sucrose (non-electrolyte)

m is the same in both solutions.

But K_f (freezing point depression constant) depends on the solvent So, if different solvents are used, they will have different K_f​ values, hence different freezing point depressions.