The molal depression constant depends upon

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nature of the solute

nature of the solvent

heat of solution of the solute in the solvent

vapour pressure of the solution

answer is B.

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Detailed Solution

Depression in freezing point is denoted by ΔT and depression in freezing point is directly proportional to the molality of solvent.
ΔT∝M
Here M is molarity of solvent
For removing proportional signs we need a constant and this constant is a molal depression constant.
ΔT=K_f.M
Molal depression constant is represented by K_fthat depends upon quality of solvent and molality is the nature of solvent

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