The solubility of $\mathrm{AgCl}$ in water is increased by adding aqueous ammonia. The main reason is

1. Aformation of the soluble complex $[\mathrm{Ag}(\mathrm{NH}{}_3){}_2]{}^{+}$, which lowers $[\mathrm{Ag}{}^{+}]$
2. Bthe common ion effect of $\mathrm{NH}{}_4{}^{+}$ on $\mathrm{AgCl}$
3. Chydrolysis of $\mathrm{Cl}{}^{-}$ to give $\mathrm{HCl}$ and $\mathrm{OH}{}^{-}$
4. Da rise in the $K_{sp}$ of $\mathrm{AgCl}$ in basic medium