Q.
Which of the following solution will have highest freezing point?
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a
2 M NaCl solution
b
1.5 M AlCl3 solution
c
1 M Al2(SO4)3 solution
d
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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