Which of the following solutions will have the highest boiling point?

Options

A. `0.1M FeCI_(3)`
B. `0.1M BaCI_(2)`
C. `0.1M NaCI`
D. `0.1M` urea `(NH_(2)CONH_(2))`

Answer

D

Explanation

Except for urea (a non electrolyte) the ionisation of `FeCI_(3),BaCI_(2),NaCI` can be represented as follows
`FeCI_(3) rarr Fe^(3+) +3CI^(-)`
`BaCI_(2) rarr Ba^(2+)+2CI^(-)`
`NaCI rarr Na^(+)+CI^(-1)`
As number of particles (ions) produced is maximum in `FeCI_(3)` the elevation in boiling point (a colligative property) will be maximum in case of `FeCI_(3)`.