Question

The molecule in which hybrid MOs involve only one d-orbital of the central atom is ______.

Options

• [Ni(CN₄)]²⁻

• XeF₄

• [CrF₆]³⁻

• BrF₅

Answer 1

The molecule in which hybrid MOs involve only one d-orbital of the central atom is `bbunderline([Ni(CN_4)]^(2−))`.

Explanation:

Oxidation state of Co in [Co(ox)₂ (OH)₂]⁻ is +5,

Co : 3d⁷ 4s²

∴ Co⁵⁺ : 3d⁴

The d-orbitals are split, resulting in a distribution of electrons that is t_2g^2,1,1 e_g^0,0 under a strong ligand field. The complex will exhibit the highest paramagnetic behaviour as a result of the presence of two unpaired electrons.