0.2 molal aqueous solution of acid HX is...

0.2 molal aqueous solution of acid HX is 20% ionised. `K_f="1.86 K molal"^(-1)`. The freezing point of the solution is very close to:

A

`-0.45^(@)C`

B

`-0.90^(@)C`

C

`-0.31^(@)C`

D

`-0.53^(@)C`

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