MHT CET 2022 Chemistry question

Calculate the molality of a solution having freezing point depression 3.6 K and freezing point depression constant 4.8 K kg

(A)0.3 mol
(B)0.9 mol
(C)0.75 mol Correct
(D)0.5 mol

Answer: (C)

Solution

The depression in freezing point is , where is the molality. So m = \dfrac{\Delta T_f}{K_f} = \dfrac{3.6\ K}{4.8\ K\,kg\,mol^{-1}} = 0.75\ mol\,kg^{-1},

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Question ID VK-093977