Chemistry - Coordination Chemistry Question with Solution | TestHub

[RhCl(PPh₃)₃]: Rh is in the +1 oxidation state (d⁸) and forms a square planar complex with all electrons paired, so it is diamagnetic. [Fe(H₂O)₅(NO)]SO₄ is a nitrosyl complex containing one unpaired electron, hence paramagnetic. CsO₂ contains the superoxide ion (O₂⁻), which has one unpaired electron, making it paramagnetic. In [NiF₆]⁴⁻, Ni is +2 (d⁸) and F⁻ is a weak-field ligand, giving a high-spin octahedral complex with two unpaired electrons. Therefore, the correct answer is B, C and D.