A sample of a mixture of ${\mathrm{CaCl}}_2$ and $\mathrm{NaCl}$ weighing  4.44 gm was treated to precipitate all rthe ca as ${\mathrm{CaCO}}_3$ which was then heated and quantitatively converted to $1.12 \mathrm{g}$ of $\mathrm{CaO}$ choose the correct statements.