1.

A solution of urea \[\left( mol.\text{ }mass\text{ }56g\text{ }mo{{l}^{-1}} \right)\] boils at 100.18°C  at the atmospheric pressure. If \[{{K}_{f}}\] and \[{{K}_{b}}\]for water are 1.86 and \[0.512K\text{ }kg\text{ }mo{{l}^{-1}}\] respectively the above solution will freeze at      [CBSE PMT 2005]

A. \[\,- 6.54{}^\circ C\]
B. \[6.54{}^\circ C\]
C. \[0.654{}^\circ C\]
D. \[-0.654{}^\circ C\]
Answer» E.


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