NEET Chemistry Question (2026) — Solution

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An ambidentate ligand is a unidentate ligand that has more than one donor atom but coordinates to the central metal atom or ion through only one donor atom at a time. Thiocyanate ion (SCN^ - or NCS^ - ) has two donor atoms, sulfur (S) and nitrogen (N). It can bind to the metal through either the sulfur atom (thiocyanato) or the nitrogen atom (isothiocyanato). Thus, it is an ambidentate ligand. Ethane-1,2-diamine is a bidentate ligand. Ethylenediaminetetraacetate ion is a hexadentate ligand. Oxalate is a bidentate ligand. Answer: Thiocyanate