How many ions obtain after dissociation of this complex...

Primary valency of coordination compounds are ionisable. Thus, dissociation of the complex, $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3$ takes place as follows \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3 \longrightarrow\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{2+}+3 \mathrm{Cl}^{-} Therefore, total number of ions obtain will be 4 .