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  4. Which of the following solution will have highest freezing point?

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Q. Which of the following solution will have highest freezing point?

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Solution:

Depression in freezing point $\propto$ molality $\times n$
For $NaCl, \Delta\,T_{f} \propto 2\times 2$
For $AlCl_{3}, \Delta\,T_{f} \propto 4 \times 1.5$
For $Al_{2}(SO_{4})_{3} \Delta \,T_{f} \propto 5\times 1$
For Urea $\Delta\,T_{f} \propto 3 \times 1$
Since, lowest depression is observed for solution containing urea, hence it will have highest freezing point