The given complexes [Cr(NH3)6] [Co(CN)6] & [Co(NH3)6] [Cr(CN)6] exemplify coordination isomers. Coordination isomerism is seen by compounds in which both cation and the anion are complexes. The isomers differ with each other because of different groups being coordinated to a particular coordination center. In the example both cation and anion are complexes.
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