The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water is K_f = 1.86 k kg mol^-1)

-1.86^oC

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-3.72^oC

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3.72^oC

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1.86^oC

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Solution

The correct option is B
-3.72^oC

T_f = i.K_{f X}m = 2 x 1.86 x 1 = 3.72; F.pt = 0.0^oC-3.72^oC = -3.72^oC

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The freezing point of one molal NaCl solution assuming NaCl to be 100% dissociated in water is (molal depression constant = 1.86)

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