JEE Main 2025 Jan 22 Shift 2, Chemistry Q23: Bonding Of Co-ordination Compounds

The complex is $[Ni(dmg{)}_2]$, where dimethylglyoximate (dmgH${}^{-}$) acts as a bidentate monoanionic N,N-donor. Two dmgH${}^{-}$ ligands chelate $N{i}^{2+}$ in a square-planar arrangement, with two intramolecular O$-$H$\cdots$O hydrogen bonds linking the two ligands.

Each dimethylglyoxime ligand in the deprotonated bridged form contributes: two methyl groups ($2\times 3=6$ H) and one bridging $-OH$ proton (1 H). Total per ligand $=7$ H.

With two such ligands in the complex: total H atoms $=2\times 7=14$.