Coordination isomerism could be shown by

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(D) Coordination isomerism occurs in compounds containing both cationic and anionic coordination entities,where the ligands can be exchanged between t

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Both $(a)$ and $(b)$

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(D) Coordination isomerism occurs in compounds containing both cationic and anionic coordination entities,where the ligands can be exchanged between the metal ions.For a complex to exhibit coordination isomerism,both the cation and the anion must be coordination complexes.In option $(a)$,$[Ag(NH_3)_2][CuCl_2]$ consists of a cationic complex $[Ag(NH_3)_2]^+$ and an anionic complex $[CuCl_2]^-$. Thus,it can show coordination isomerism by exchanging ligands to form $[AgCl_2][Cu(NH_3)_2]$.In option $(b)$,$[Al(H_2O)_6][Co(CN)_6]$ consists of a cationic complex $[Al(H_2O)_6]^{3+}$ and an anionic complex $[Co(CN)_6]^{3-}$. It can also show coordination isomerism by forming $[Al(CN)_6][Co(H_2O)_6]$.Therefore,both $(a)$ and $(b)$ exhibit coordination isomerism.

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