A solution of urea (mol. mass 56 g mol -1 ) boils at 100.18 C at the atmospheric pressure. If K f and K b for water are 1.86 and 0.512K kg mol -1 respectively , the above solution will freeze at :-

1. A. -6.54 C
2. B. -0.654 C
3. C. 6.54 C
4. D. 0.654 C

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