# Molar concentration of $A{g}^{+}$ in an aqueous solution of $A{g}_{2}Cr{O}_{4}$ at 298K is 1.5 x ${10}^{-4}$${K}_{sp}$, for $A{g}_{2}Cr{O}_{4}$ is

1.125 x ${10}^{-8}$

2.5 x ${10}^{-4}$

2.25 x${10}^{-8}$

1.6875 x ${10}^{-12}$