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Q.

Elevation in boiling point of an aqueous solution of a non-electrolyte solute is 2.01o. What is the depression in freezing point of this solution? Kb(H2O)=0.52o mol−1 kgKf(H2O)=1.86o mol−1 kg

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a

7.17o

b

0.52o

c

3.57o

d

0.93o

answer is A.

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Detailed Solution

ΔTb=Molality×KbΔTb=mKbΔTf=mKf∴ ΔTfΔTb=KfKb=1.860.52=3.57 ∆Tf=3.57×2.01=7.175
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