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$\text{HINT: NO}_3^- , \text{NO}_2^- \text{ are different ligands.}$ $\text{Explanation :}$ $1. \text{Hydrate isomers : Hydrate isomers are the type of isomers which have similar composition but differ in the presence of number of water molecules as ligands.}$ $\text{e.g. } [\text{Co(NO}_2)(\text{H}_2\text{O})(\text{en})_2]\text{Cl}_2 , [\text{CoCl(NO}_2)(\text{en})_2]\text{Cl} \cdot \text{H}_2\text{O} \text{ are hydrate isomers.}$ $2. \text{Co-ordination isomers : Co-ordination isomers are two or more coordination compounds in which the composition within the coordination sphere (i.e., the metal atom plus the ligands that are bonded to it) is different (i.e., the connectivity between atoms is different).}$ $\text{e.g. } [\text{Cu(NH}_3)_4][\text{PtCl}_4] , [\text{CuCl(NH}_3)_3][\text{PtCl}_3(\text{NH}_3)] \text{ are co-ordination isomers.}$ $3. \text{Ionization isomers : Ionization isomers are identical except for a ligand has exchanged places with an anion or neutral molecule that was originally outside the coordination complex.}$ $\text{e.g. } [\text{Ni(CN)(H}_2\text{O})(\text{NH}_3)_4]\text{Cl} , [\text{NiCl(H}_2\text{O})(\text{NH}_3)_4]\text{CN} \text{ are ionization isomers.}$ $4. \text{Linkage isomers : Linkage isomers are coordination compounds that have the same composition but differ in the connectivity of the ligand to the metal.}$ $\text{e.g. } [(\text{NH}_3)_5\text{Co-SCN}]^{2+} \text{ and } [(\text{NH}_3)_5\text{Co-NCS}]^{2+} \text{ are linkage isomers.}$ $\text{But } [\text{Cr(NO}_2)(\text{NH}_3)_5][\text{ZnCl}_4] , [\text{Cr(NO}_3)(\text{NH}_3)_5][\text{ZnCl}_4] \text{ are not linkage isomers as the ligands are different in the complex.}$