Define coordination isomerism and hydrate isomerism.

(N/A) $1$. Coordination Isomerism: This type of isomerism occurs in coordination compounds containing both cationic and anionic complex ions of different metal ions. The isomerism arises from the interchange of ligands between the cationic and anionic entities. For example,$[Co(NH_3)_6][Cr(CN)_6]$ and $[Cr(NH_3)_6][Co(CN)_6]$.
$2$. Hydrate Isomerism: This is a special type of ionization isomerism where water molecules act as ligands. It occurs when water molecules can be either inside the coordination sphere (as ligands) or outside the coordination sphere (as water of crystallization). For example,$[Cr(H_2O)_6]Cl_3$ (violet) and $[Cr(H_2O)_5Cl]Cl_2 \cdot H_2O$ (blue-green).