For which among the following equimolar aqueous solutions Van’t Hoff factor has the lowest value ?

Question

For which among the following equimolar aqueous solutions Van’t Hoff factor has the lowest value ? (A) Aluminium Chloride (B) Potassium Sulphate (C) Ammonium Chloride (D) Urea

Tardigrade Admin · Accepted Answer

For the aqueous solution of urea, van't Hoff factor has the lowest value.
Urea is non-electrolyte and does not dissociate in aqueous solution.
Hence, Van't Hoff factor is

1

.
For aluminium chloride

A lC l_{3}, i = 4

A lC l_{3} \to A l^{3 +} + 3 C l^{-}

For potassium sulphate

K_{2} S O_{4}, i = 3

K_{2} S O_{4} \to 2 K^{+} + S O_{4}^{2 -}

Q. For which among the following equimolar aqueous solutions Van’t Hoff factor has the lowest value ?

Aluminium Chloride

Potassium Sulphate

Ammonium Chloride

Urea