Question

Which of the following aqueous solution has minimum freezing point?

(a) 0.01 m NaCl

(b) 0.005 m C₂H₅OH

(c) 0.005 m MgI₂

(d) 0.005 m MgSO₄

Answer 1

Correct option (a) 0.01 m NaCl

Explanation :

van't Hoff factor, i = 2 for NaCl, so conc. = 0.02, which is maximum in the present case.

Hence, ΔT_f is maximum or freezing point is minimum in 0.01 m NaCl.