0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If K f for water is 1.86 K kg mol -1 ,the lowering in freezing point of the solution is

1. A. 0.56 K
2. B. 1.12 K
3. C. – 0.56 K
4. D. – 1.12 K

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