Topic: Colligative properties· Solutions

If molality of the dilute solution is doubled, the value of molal depression constant (K_f) will be :

1. halved

2. tripled

3. unchanged

4. doubled

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 3. unchanged

Key idea: \(K_f\) is a property of the solvent only.

\(\Delta T_f = K_f\,m\). \(K_f\) is the depression for a 1 molal solution and depends on the nature of the solvent, not on the amount of solute. Doubling the molality doubles \(\Delta T_f\), but \(K_f\) stays unchanged.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?

If molality of the dilute solution is doubled, the value of molal depression constant (K_f) will be :

1 answer

Your answer