Which from following complexes contains anionic ligand?

Step-by-step solution

To identify the complex containing an anionic ligand, examine the charge characteristics of each ligand in the coordination sphere. In the tetraamminecopper(II) ion [ Cu ( NH ₃)4]²⁺ , the ammine ligand NH ₃ is neutral. The pentaammineaquacobalt(III) iodide complex [ Co ( NH ₃)5( H ₂ O )]³⁺ contains neutral ammine and aqua ligands NH ₃ and H ₂ O . In tetracyanonickelate(II) ion [ Ni(CN) ₄]²⁻ , the cyano ligand CN ⁻ carries a -1 charge, confirming its anionic character. Pentacarbonyliron(0) [ Fe(CO) ₅] features the n