Consider the following aqueous solutions and assume 100% ionisation in electrolytes :
I. `0.1 m` urea
II. `0.04 m Al_(2)(SO_(4))_(3)`
III. `0.0.5 m CaCl_(2)`
IV. `0.005m NaCl`
The correct statement regarding the above solutions is :

Options

A. Freezing point will be lowest for solution 1
B. Freezing point will be highest for solution 4
C. Boiling point will be highest for solution 4
D. Vapour pressure will be highest for solution 2

Answer

B

Explanation

Particle concentration.
(1) 0.1 m
(2) `0.04 xx =0.2 m`
(3) `0.05 xx 3 = 0.15 m`
(4) `0.005 xx 2 = 0.01 m`
Solution (4) has the lowest concentration, depression in freezing point will be minimum and hence actual freezing point will be highest.