Q. 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) :
A) 0.80 K
B) 0.40 K
C) 0.60 K
D) 0.20 K
Explanation
[Solution] $\Delta T_f = K_f m = 5.12 \times 0.078 = 0.399 \approx 0.40$ K. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.