Which of the following aqueous molal solution have highest freezing point

Options

A. Urea
B. Barium chloride
C. Potassium bromide
D. Aluminium sulphate

Answer

A

Explanation

`KBr=K^(+)+Br^(-)=2` ions
`BaCl_(2)=Ba^(2+)+2Cl^(-)=3` ions
`Al_(2)(SO_(4))_(3)=2Al^(3+)=3SO_(4)^(2-)=5` ions
`therefore` Urea is not ionised hence it shows highest freezing point.