In a \( 0.2 \) molal aqueous solution of a weak acid \( \mathrm{HX} \) the degree of dissociatio...

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In a \( 0.2 \) molal aqueous solution of a weak acid \( \mathrm{HX} \) the degree of dissociation is \( 0.25 \). The freezing point of the solution will be nearest to: \( \left(K_{f}=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\right) \)
(a) \( -0.26^{\circ} \mathrm{C} \)
(b) \( 0.465^{\circ} \mathrm{C} \)
(c) \( -0.48^{\circ} \mathrm{C} \)
(d) \( -0.465^{\circ} \mathrm{C} \)
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