Which among the following pairs of solutions is isotonic in nature?

A solution of non volatile solute has boiling point elevation $0.70$ K if $K_b$ for the solvent is $2.44\ \text{K kg mol}^{-1}$. What is the molality of the solution?

van't Hoff factor for $\text{BaCl}_2$ is $2.47$, calculate the percentage dissociation of in its aqueous solution.

What is number of moles of electron passed when a current of $2$ Amp flows through solution of electrolyte for $10$ minutes?