Q. The relative lowering of vapour pressure of an aqueous solution containing non-volatile solute is 0.0125. The molality of the solution is
A) 0.1 M NaCl
B) 0.1 M $BaCl_{2}$
C) 0.1 M sucrose
D) 0.1 M KCl
Explanation
(b)
Colligative properties depend upon number of particles in solution and concentration of solution. Larger the number of particles in solution, higher is the colligative properties.
Hence, highest boiling point is found in 0.1 M $BaCl_{2}.$
$BaCl_{2}(aq) \longrightarrow B^{2 +} + 2Cl^{-}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.