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Question:

Elevation in the boiling point for 1 molal solution of glucose is 2K. The depression in the freezing point of 2 molal solutions of glucose in the same solvent is 2K. The relation between Kb and Kf is?

Kb=0.5Kf

Kb=2Kf

Kb=1.5Kf

Kb=Kf

Solution:

ΔTb/ΔTf = (i × m × Kb)/(i × m × Kf)
2/2 = (1 × 1 × Kb)/(1 × 2 × Kf)
Kb = 2Kf