Question

The ratio of the value of any colligative property for $Ba{Cl}_2$ solution to that for urea solution under similar condition is:

• A. 2
• B. 3
• C. 1
• D. 4

Answer 1

The correct option is B 3

The ratio of the value of any colligative property for $Ba{Cl}_2$ solution of urea solution under similar conditions is $3:1$.

1 molecule of $Ba{Cl}_2$ dissociates to give 3 ions.

$Ba{Cl}_2\to B{a}^{2+}+2C{l}^{-}$

Hence, the van't Hoff factor 'i' for $Ba{Cl}_2$ is 3.

Urea is non-electrolyte and hence does not dissociate.

Hence, the van't Hoff factor 'i' for urea is 1.

The ratio of the value of any colligative property for $Ba{Cl}_2$ solution of urea solution under similar conditions is equal to the ratio of the values of the vant Hoff factor 'i' for $Ba{Cl}_2$ and urea.

Option B is correct.