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A0.2 molal aqueous solution of a week ac...

A`0.2` molal aqueous solution of a week acid (HX) is 20 % ionised,The frrezing point of this solution is (Given `k_(f)=1.86^(@)Ckg mol^(-1)` for water) :

A

`-0.45^(@)C`

B

`-0.90^(@)C`

C

`-0.31^(@)C`

D

`-0.53^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaT_(f)=0.2xx1.2xx1.86=0.45`
therefore freezing point=`-0.45^(@)C`
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