Which of the following statements is correct?

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(C) $1$. Linkage isomerism is shown by ligands that have two donor atoms (ambidentate ligands). In $[Pt(NO_3)_2(en)_2]^{2+}$,the $NO_3^-$ ion is not a

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$FeCl_3 \cdot 6H_2O$ can show hydrate isomerism

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(C) $1$. Linkage isomerism is shown by ligands that have two donor atoms (ambidentate ligands). In $[Pt(NO_3)_2(en)_2]^{2+}$,the $NO_3^-$ ion is not an ambidentate ligand,so it does not show linkage isomerism.$2$. Ionization isomerism occurs when the counter ion in the coordination sphere is a potential ligand and can displace a ligand in the coordination sphere. In $[Cr(CO_3)(NH_3)_4]Br$,the $Br^-$ ion can exchange with the $CO_3^{2-}$ ligand,thus it exhibits ionization isomerism.$3$. Hydrate isomerism is a form of ionization isomerism where water molecules are involved as ligands or lattice water. $FeCl_3 \cdot 6H_2O$ is a hydrate,but it is typically represented as $[Fe(H_2O)_6]Cl_3$ or other coordination isomers like $[Fe(H_2O)_5Cl]Cl_2 \cdot H_2O$,which exhibit hydrate isomerism.$4$. $[FeCl_3(NH_3)_3]$ can exhibit geometrical isomerism (facial and meridional),which is a type of stereoisomerism,not structural isomerism.Therefore,both $B$ and $C$ are technically correct in a broad sense,but $C$ is the classic textbook example for hydrate isomerism.

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