Acid is 20% ionised in solution

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Problem

0.2 molal0.2 \text{ molal} acid HX\text{HX} is 20% ionised in solution. Kf=1.86 K molality−1K_f = 1.86 \text{ K molality}^{-1} . The freezing point of the solution is : (1) −0.45∘C-0.45^\circ\text{C} (2) −0.90∘C-0.90^\circ\text{C} (3) −0.31∘C-0.31^\circ\text{C} (4) −0.53∘C-0.53^\circ\text{C}

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