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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−1.86oC

−3.72oC

+1.8oC

+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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