Which one of the following aqueous solutions will exhibit highest boiling point?

Options

A. `0.01M Na_(2)SO_(4)`
B. 0.015M glucose
C. 0.015M urea
D. `0.01 M KNO_(3)`

Answer

A

Explanation

Since, glucose and urea are non-electrolytes and the van.t Hoff factor for `KNO_(3)` is 2 and for `Na_(2)SO_(4)` it is 3.
`KNO_(3) rarr K^(+) + NO_(30^(-) (i=2)`
`Na_(2)SO_(4) rarr 2Na^(+) + SO_(4)^(2-) (i=2 +1=3)`
Thus, from the expression `Delta T_(b)= ixx K_(b) xx m " as " Delta T_(b) prop i, 0.01 M Na_(2)SO_(4)` will have the highest boiling point.