A solution of urea ( mol.mass 60 g/ mol) boils at 100.18 degrees at the atmospheric pressure . If Kf and Kb for water are 1.86 and 0.512 K Kg/mol respectively, the above solution will freeze at (1) -6.54 degrees (2) 6.54 degrees (3) 0.654 degrees (4) -0.654degrees

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