Which of the following expressions gives the correct equation for the freezing point depression of an ideal dilute solution? (Choose the correct one.)

medium MCQ 3 marks Class 12 · Chemistry · Solutions

Answer

ΔT_f = K_f × m

The correct answer is ΔT_f = K_f × m — The correct relation is $Δ T_{f} = K_{f} \times m$ , without division or multiplication by $i$ .

Step-by-step solution

Identify the colligative property: freezing point depression depends on the molality of the solute.
Recall that for a non‑volatile solute the van’t Hoff factor $i = 1$ .
The correct relation is $Δ T_{f} = K_{f} \times m$ , without division or multiplication by $i$ .

Common mistake: Including van't Hoff factor

i

for non‑volatile solutes

Concept tested: Freezing point depression

Published 5 September 2026 · Last updated 16 September 2026 · How this solution was prepared and checked