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0.5 molal aqueous solution of a weak aci...

0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If `K_(f)` for water is `1.86K kg mol^(-1)`, the lowering in freezing point of the solution is

A

`-0.56K`

B

`-1.12 k`

C

`0.56k`

D

`1.12k`

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The correct Answer is:
D
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