Question

Which of the following aqueous solution has highest freezing point ?

• A. $0.1$ molal $Al_2(SO_4)_3$
• B. $0.1$ molal $BaCl_2$
• C. $0.1$ molal $Al_2Cl_3$
• D. $0.1$ molal $NH_4Cl$

Answer 1

Answer: (D)

$0.1$ molal $NH_4Cl$

Answer 2

Colligative property $\alpha$ number of particles after dissociation or association means less be the number of particles, more lower be the freezing point and more be the number of particle more lower be the freezing p?int.

Hence for $NH _{4} Cl , n=i=2$

which is gives least number of particle hence show highest freezing point.