Question

The complex ion [NiCl4]2- is paramanetic whereas the complex ion [Ni(CN)4]2- is diamagnetic. Explain on the basis of Crystal Field Theory

Answer 1

[NiCl4]2- the ligand Cl is weak field ligand so pairing does not occur

[NiCN4]2-ligand CN is strong field ligand

8electrons are present in d orbitals

as per crystal field theory