A solution of urea (mol. mass 56 gmol−1) boils at 100.18oC at the atmospheric pressure. If Kf and Kb for water are 1.86 and 0.52 Kkg.mol−1 respectively, the above solution will freeze at:
A
−6.54o
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B
6.54oC
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C
0.654oC
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D
−0.654oC
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Solution
The correct option is D−0.654oC ∵ΔTf=Kf× molality of solution