The ratio of the value of any colligative property for KCl solution to that of sugar solution is

$\text{ van't Hoff factor }\left(\mathrm{i}\right)=\frac{\text{ Exp. C. P. }}{\text{ Cal. C. P. }}=1-\mathrm{\alpha }+\mathrm{x\alpha }+\mathrm{y\alpha };$

$\text{ For }\mathrm{KCl}\text{ it is }=2\text{ and for sugar it is equal to }1\text{. }$

$\therefore \frac{{\text{ C.P}}_{\text{.KCl}}}{{\text{ C.P}}_{\text{.Sugar}}}=2$