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Question

# Which of the following is/are correct? Here, Kf is cryoscopic constant Tf is F.P. of pure solvent M is the molar mass of solvent ΔHfus is the molar enthalpy of fusion of the solvent All quantities are in SI units

A
Kf=R×T2f×M1000×ΔHfus
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B
Cryoscopic constant is the elevation in freezing point when the molality of solution is equal to that of depression in freezing point.
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C
Kf value is dependent on the nature of solvent
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D
Kf value is dependent of the nature of the solute.
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Solution

## The correct option is C Kf value is dependent on the nature of solventDepression in Freezing Point is a colligative property. It is dependent on solute concentration and not its nature. Option (c) is correct, and (d) is incorrect. Cryoscopic constant is the depression in freezing point when the molality of solution is unity. Option (b) is incorrect. Kf=R×T2f×M1000×ΔHfus=R×T2f1000×Lfus Lfus is the latent heat of fusion of the solvent per g Option (a) is correct. Unit of Cryoscopic constant is K kg mol−1

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