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

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0.5 molal aqueous solution of a weak acid (HX) is 20% ionized. If K_f for water is 1.86 K 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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p_A and p_Bare the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If x_A represents the mole fraction of component A, the total pressure of the solution will be

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