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Q.

What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non volatile solute (molar mass 256 g mol–1) and the decrease in freezing point is 0.40 K?

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a

4.43 K kg mol–1

b

3.72 K kg mol–1

c

5.12 K kg mol–1

d

1.86 K kg mol–1

answer is A.

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Detailed Solution

ΔTf=Kb⋅m0.4=Kb125650×10−3Kb=5.12Kkg/mol

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