Among Ni(CO)4,Ni(CN)42− and Ni(Cl)42−:
NiCO4 and NiCl42− are diamagnetic and NiCN42− is paramagnetic
NiCl42− and NiCN42− are diamagnetic and NiCO4 is paramagnetic
NiCO4 and NiCN42− are diamagnetic and NiCl42− is paramagnetic
NiCO4 is diamagnetic and NiCl42− and NiCN42− are paramagnetic