The type of isomerism exhibited by the pair of complexes [ Co ( NH ₃ )₅ ( NO ₂ ) ] Cl ₂ and [ Co ( NH ₃ )₅( ONO ) ] Cl ₂ , and the oxidation state of the central metal ion in these compounds, respectively, are:

Step-by-step solution

The complexes [ Co ( NH ₃ )₅ ( NO ₂ ) ] Cl ₂ and [ Co ( NH ₃ )₅( ONO ) ] Cl ₂ differ only in the point of attachment of the ambidentate ligand NO ₂^- (N-bound vs O-bound). This type of isomerism is called linkage isomerism. Let the oxidation state of Co be x . The complex ion is [ Co ( NH ₃ )₅ ( NO ₂ ) ]²⁺ . x + 5(0) + (-1) = +2 x = +3 Thus, the isomerism is linkage isomerism and the oxidation state is +3 . Answer: Linkage isomerism, +3