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A 0.2 molal aqueous solution of a weak a...

A `0.2` molal aqueous solution of a weak acid `HX` is `20%` ionized. The freezing point of the solution is `(k_(f) = 1.86 K kg "mole"^(-1)` for water):

A

`-0.45^(@)C`

B

`-0.9^(@)C`

C

`-0.31^(@)C`

D

`-0.53^(@)C`

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