`[Co(HN_(3))_(6)][Cr(CN)_(6)]` and `[Cr(NH_(3))_(6)][Co(CN)_(6)]` are .

Options

A. Coordination position isomerism
B. Polymerization isomerism
C. Coordination isomerism
D. Ionization isomerism

Answer

C

Explanation

When both the positive and negative ions of a corrdination compound are complex ions, coordination isomerism is possible and is caused by the interchange of ligands between the anion and cation:
`[Co(NH_(3))_(6)][Cr(CN)_(6)]`
`[Co(NH_(3))_(5)CN][Cr(NH_(3))CN)_(5)]`
`[Co(NH_(3))_(4)(Cr)_(2)][Cr(NH_(3))_(2)(CN)_(4)]`
`[Co(NH_(3))_(3)(CN)_(3) [Cr(NH_(3))_(3)(CN)_(3)]` is not possible as both units are neutral species
`[Cr(NH_(3))_(4)(CN)_(2)][Co(NH_(3))_(2)(CN)_(4)]`
`[Cr(NH_(3))_(5)CN][Co(NH_(3))(CN)_(5)]`
`[Cr(NH_(3))_(6)][Co(CN)_(6)]`