MHTCET 14 May 2023 Shift 2 Solved Paper

The coordination complex that contains a neutral ligand among the given options is:Option A: Pentacarbonyl iron(0), which has the formula $\mathrm{Fe}(\mathrm{CO})_5$Ligands can be neutral molecules or anions that donate a pair of electrons to the metal center to form coordinate bonds. Carbonyl (CO) is a common example of a neutral ligand, as it contains a carbon atom triple-bonded to an oxygen atom and has a lone pair of electrons that can be donated to a metal atom. In the complex $\mathrm{Fe}(\mathrm{CO})_5$, the iron atom is surrounded by five carbonyl ligands, all of which are neutral.Option B: Trioxalatocobaltate(III) ion contains oxalate ligands $(\mathrm{C}_2\mathrm{O}_4^{2-})$, which are anionic.Option C: Sodium hexanitrocobaltate(III), $\mathrm{Na}_3[\mathrm{Co}(\mathrm{NO}_2)_6]$, contains nitro $(\mathrm{NO}_2^{-})$ligands, which are also anionic.Option D: Tetracyanonickelate(II) ion, $[\mathrm{Ni}(\mathrm{CN})_4]^{2-}$, contains cyanide ligands $(\mathrm{CN}^{-})$, which are anionic as well.Hence, the complex with a neutral ligand is Option A: Pentacarbonyl iron(0).