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A 0.2 molal solution of KCl freezes at -...

A `0.2 molal` solution of `KCl` freezes at `-0.68^(@)C`. If `K_(f)` for `H_(2)O` is `1.86`, the degree of dissociation of `KCl` is
a.`85%` , b.`83%` , c. `65%` , d. `90%`

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