The depression of freezing point of a dilute solution is directly proportional to which quantity?
Athe molality of the solution
Bthe boiling point of the solvent
Cthe mole fraction of the solvent
Dthe molarity of the solution
Answer & Solution
Correct answer: A. the molality of the solution
1. For dilute solutions, $\Delta T_f \propto m$, where m is molality.
2. Introducing Kf gives $\Delta T_f = K_f m$.
3. Like boiling point elevation, it is tied to molality, not molarity or mole fraction of solvent.
_Source: NCERT Class 12 Chemistry Ch 1 "Solutions", p.17_
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