Chemistry - Liquid Solution Question with Solution | TestHub

1 g of a mixture containing NaCl and ${\mathrm{CaCl}}_2$ is dissolved in water. Sodium oxalate on addition to this solution completely converts ${\mathrm{CaCl}}_2$ to ${\mathrm{CaC}}_2{\mathrm{O}}_4$. The ${\mathrm{CaC}}_2{\mathrm{O}}_4$ is filtered and dissolved in dil. ${\mathrm{H}}_2{\mathrm{SO}}_4$. The clear solution requires 20 mL of $0.1\mathrm{M}{\mathrm{KMnO}}_4$. Calculate freezing point in K of an aqueous solution prepared by dissolving 5 g of same mixture containing ${\mathrm{CaCl}}_2$ and NaCl in 100 g water. ${\mathrm{K}}_{\mathrm{f}}$ of water is $1.86\mathrm{K}{\mathrm{kg}}^{-1}{\mathrm{mol}}^{-1}$. Assume complete dissociation of ${\mathrm{CaCl}}_2$ and NaCl . (Given $0^{\circ }\mathrm{C}\equiv 273\mathrm{K}$ )