$K_{sp}$ of $\mathrm{AgCl}, {\mathrm{Ag}}_2{\mathrm{CrO}}_4$ and $\mathrm{AgBr}$ are ${10}^{-10}, {10}^{-13}$ and ${10}^{-12}$ respectively. If to a solution of 0.1 M each of ${\mathrm{Cl}}^{-},{ \mathrm{CrO}}_4^{2-}$ and ${\mathrm{Br}}^{-}$ ions, ${\mathrm{AgNO}}_3$ is added slowly, which will precipitate first :