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Q.

The freezing point of one molal NaCl solution assuming NaCl to be 100% dissociated in water is (molal depression constant = 1.86)

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a

−1.86oC

b

−3.72oC

c

+1.8oC

d

+3.72oC

answer is B.

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Detailed Solution

For NaCl,  i=2ΔTf=2 Kf m=2×1.86×1=3.72Ts=T0−ΔTf=0−3.72=−3.72oC
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