Chemistry - Ionic Equilibrium Question with Solution | TestHub

The value of ${\mathrm{K}}_{sp}$ of ${\mathrm{CaCO}}_3$ and ${\mathrm{CaC}}_2{\mathrm{O}}_4$ are $4.7\times 10^{-9}$ and $1.3\times 10^{-9}$ respectively at $25^{\circ }\mathrm{C}$. If the mixture of these two is washed with water, what is the concentration of ${\mathrm{Ca}}^{2+}$ ions in water?NEET 2013 (Karnataka)