Chemistry - Ionic Equilibrium Question with Solution | TestHub

Here$\mathrm{C}{\mathrm{r}}_2{\mathrm{S}}_3$is soluble in excess of ammonia while ZnS, MnS, FeS do not dissolve in excess$\mathrm{N}{\mathrm{H}}_3$solution due to their low${\mathrm{K}}_{\mathrm{s}\mathrm{p}}$values.
$\mathrm{C}{\mathrm{r}}_2{\mathrm{S}}_3+6\mathrm{N}{\mathrm{H}}_3\rightleftharpoons \left[\mathrm{C}\mathrm{r}\right(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{3+}+{\mathrm{S}}^{2-}\left(\mathrm{a}\mathrm{q}\right)$