Q.

Freezing point of an aqueous solution is −0.186oC. Elevation of boiling point of the same solution is ________ if Kb=0.512 K molality−1 and Kf=1.86 K molality−1:

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0.186oC

0.0512oC

0.092oC

0.237oC

answer is B.

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Detailed Solution

ΔTf=1000.Kf.wW.m and ΔTb=1000.Kb.wW.m∴ ΔTfΔTb=KfKb 0.186ΔTb=1.860.512∴ ΔTb=0.05120c

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