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Question

A solvent X freezes at 240C. If 0.25 molal solution of a non volatile solute in pure X causes freezing point depression of 3C, then Kf (in K kg mol1) for solvent X is:

Assume complete association/dissociation of solute.

A
120 K kg mol1
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B
20 K kg mol1
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C
12 K kg mol1
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D
16 K kg mol1
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Solution

The correct option is C 12 K kg mol1
Here depression in freezing point is ΔTf=3C=3 K.
Kf=ΔTfm=30.25=12 K kg mol1

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