Answer: Exchange of ligands between two complex centres in a compound with both + and - complex ions.
- A Exchange of ligands between two complex centres in a compound with both + and - complex ions
- B The oxidation state formally assigned to each central metal ion present in the salt
- C The total number of ligands individually attached to each of the two metal centres
- D Geometry alone, while keeping an identical ligand distribution shared between centres
Correct answer: A. Exchange of ligands between two complex centres in a compound with both + and - complex ions
Explanation: Coordination isomers: in a compound with two complex ions, ligands redistribute between the cationic and anionic complex. E.g., [Co(en)3][Cr(CN)6] vs [Cr(en)3][Co(CN)6].
The three common coordination geometries: octahedral (6 ligands), tetrahedral (4 ligands), and square planar (4 ligands in one plane).
Concept context
Study of compounds where a central metal atom is bonded to surrounding ligands. Covers nomenclature, types of isomerism, bonding theories (VBT, CFT), and applications in medicine, photography, and industry.