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In the depression of freezing point experiment A. Vapour pressure of the solution is less than that of pure solvent B. Vapour pressure of the solution is more than that of pure solvent C. Only solute molecules solidify at the freezing point D. Only solvent molecules solidify at the freezing point Choose the most appropriate answer from the options given below:

1. A and D only
2. B and C only
3. A only
4. A and C only

Correct answer: A and D only

Solution

The correct option is A and D because the presence of a solute lowers the vapor pressure of the solution compared to that of the pure solvent, which is consistent with colligative properties. Additionally, at the freezing point, it is primarily the solvent molecules that solidify, while the solute remains in solution.

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