Which of the following aqueous solution has the highest boiling point

Options

A. `"0.1 M KNO"_(3)`
B. `"0.1 M "Na_(3)PO_(4)`
C. `0.1M BaCl_(2)`
D. `.1 M K_(2)SO_(4)`

Answer

B

Explanation

Higher the concentration of ions in the solution. Higher is the elevation in boiling point. As 0.1 M `Na_(3)PO_(4)` has highest concentration of ions, elevation of boiling point is highest for 0.1 M `Na_(3)PO_(4)` and so is the boiling point. Alternatively, `DeltaT_(b)=iK_(b)m`. For the same value of m, higher is the value of i, higher is `DeltaT_(b)`.