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Q.

The freezing point depression constant  Kf  of benzene is  5.12 K kg mol1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places):

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a

0.40K

b

0.20K 

c

0.80K

d

0.60K     

answer is B.

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Detailed Solution

ΔTf=Kfm=5.12×0.078=0.3990.40K

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