0.5 molal aqueous solution of a weak ac...

0.5 molal aqueous solution of a weak acid is 20% iionized. If `K_f` for water is `1.86K kg mol^-1`. The lowering in freezing point of the solution is

`-0.56 K`

`-1.12 K`

`0.56 K`

`1.12 K`

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