Question

Which is diamagnetic?
(a) [Fe(CN)₆]³⁻
(b) [Co(F₆)]³⁻
(c) [Ni(CN)₄]²⁻
(d) [NiCl₄]²⁻

Answer 1

[Ni(CN)4]2-

As all e- will get paired due to presence of strong field ligand

In case of [Fe(CN)4]3- ,1e- will remain unpaired