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In a 0.5 molal solution KCl, KCl is 50% ...

In a 0.5 molal solution KCl, KCl is 50% dissociated. The freezing point of solution will be (`K_(f)` = 1.86 K kg `mol^(-1)`):

A

`-0.45^@C`

B

`-0.90^@C`

C

`-0.31^@C`

D

`-0.53^@C`

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