The freezing point depression constant (K_f) of benzene is 5.12 K kg mol^-1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places) :

1. 0.20 K

2. 0.80 K

3. 0.40 K

4. 0.60 K

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

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Answer: 3. 0.40 K

Depression in freezing point: $\Delta T_f=K_f\,m$.

$$\Delta T_f=5.12\times0.078=0.399\approx0.40\ \mathrm{K}$$

Option (3) is correct.

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

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