Q.

The freezing point depression constant (Kf) of benzene is 5.12 K kg mol-1 . The freezing point depression for the solution of molarity 0.078 m containing a non-electrolyte solute in benzene is (round off up to two decimal places )

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a

0.20 K

b

0.40 K

c

0.60 K

d

0.80 K

answer is C.

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Detailed Solution

Given 

Kf=5.12 k kg mol-1

Molarity (m) = 0.078 m

ΔTf=?

ΔTf=Kf. m=5.12×0.078=0.399=0.40​K

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