The magnetic moment of $Cr(CO)_6$ is .....

The diamagnetic species is

The total number of geometrical isomers possible for an octahedral complex of the type $[MA_{2}B_{2}C_{2}]$ is ($M=$ transition metal; $A, B$ and $C$ are monodentate ligands).

Among the following ions,which one has the highest paramagnetism?

Which of the following metal ions will form complexes with the same magnetic moment and geometry irrespective of the nature of ligands?

The total number of possible isomers of the complex compound $[Cu(NH_3)_4] [PtCl_4]$ is: