Q.

Which of the following solution will have highest freezing point?

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2 M NaCl solution

1.5 M AlCl3 solution

1 M Al2(SO4)3 solution

3 M Urea solution

answer is D.

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Detailed Solution

Depression in freezing point ∝ molality ×nFor NaCl, ΔTf∝2×2For AlCl3,ΔTf∝4×1.5For Al2(SO4)3ΔTf∝5×1For Urea ΔTf∝3×1Since, lowest depression is observed for solution containing urea, hence it will have highest freezing point.∆Tf α1Freezing point of solution

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