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Q.

In a 0.2 molal aqueous solution of a weak acid HX the degree of dissociation is 0.25. The freezing point of the solution will be nearest to: (Kf=1.86Kkgmol1)

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a

0.465°C

b

-0.465°C

c

-0.48°C

d

-0.26°C

answer is D.

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Detailed Solution

i=1+α1.25 ΔTf=Kfm.i1.86×0.2×1.25  or ΔTf=0.465 or Tf=0.465C

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