The van't Hoff factor for $Ca(NO_3)_2$ is ...... .

$17.4\% (W/V)$ of potassium sulphate $(mol. wt. = 174)$ is isotonic with $4\% (W/V)$ aqueous solution of $NaOH$. If $NaOH$ is $100\%$ ionised,the degree of ionisation of potassium sulphate is $.......... \%$.

The percentage dissociation of a salt $(MX_3)$ solution at a given temperature $($van't Hoff factor $i = 2)$ is $..........\%$ ($Nearest$ $integer$).

Which one of the following electrolytes has the same value of van't Hoff factor $(i)$ as that of $Al_2(SO_4)_3$ (if all are $100 \%$ ionised)?

$A$ $0.5 \ m$ aqueous solution of a weak acid $(HX)$ is $20\%$ ionized. If $K_f$ for water is $1.86 \ K \ kg \ mol^{-1}$,the depression in freezing point of the solution is ....... $K$.

Which of the following aqueous solutions has the highest boiling point,under identical conditions having a concentration of $0.03 \ m$?