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From the chapter: Solutions and Colligative Properties

Equimolal aqueous solutions of glucose, NaCl and CaCl₂ are compared. The order of freezing-point depression is:

Show the answer and why

Answer: B.

ΔT_f = iK_f m, and at equal molality the only difference is i: 1 for glucose, 2 for NaCl and 3 for CaCl₂. So the depressions stand in the ratio 1 : 2 : 3. The first option is the trap for candidates who remember that colligative properties ignore the identity of the solute but forget that they count particles, and an electrolyte supplies several particles per formula unit.

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