JEE Main · 2005 · 08 May 2005 · Offline · Solutions

Equimolar solutions in the same solvent have

(A)Same boiling point but different freezing point
(B)Same freezing point but different boiling point
(C)Same boiling and same freezing points✓ Correct
(D)Different boiling and different freezing points

Answer: (C)

Solution

Boiling-point elevation and freezing-point depression are colligative properties, each proportional to the molality of the solution through

Δ T_{b} = K_{b} m

and

Δ T_{f} = K_{f} m

. Equimolar solutions made in the same solvent share the same molality and the same solvent constants, so both effects come out identical. Their boiling points coincide and their freezing points coincide.

JEE Main · 2005 · 08 May 2005 · Offline · Single correct option

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