A solution of urea (molar mass of urea 60) boils at 100.18oC at atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K molality−1 respectively, the above solution will freeze at

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−6.54oC

6.54oC

−0.654oC

0.654oC

answer is C.

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Detailed Solution

ΔTbΔTf=KbKf∴ ΔTf=KfKb×ΔTb=1.860.512×0.18=0.654∴ f.pt.=0−0.654=−0.654oC

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