The spin-only magnetic moment of cobalt in $Hg[Co(SCN)_4]$ is....

Coordination isomerism could be shown by

The optically active species among the following is

The correct order regarding the number of unpaired electrons present in the following complexes is
$I. [Fe(CN)_6]^{4-} \quad II. [Fe(H_2O)_6]^{2+} \quad III. [Co(H_2O)_6]^{2+}$

Square planar complex of the type $MAXBL$ (where $A, B, X$ and $L$ are unidentate ligands) shows which of the following sets of isomers?

Which of the following pairs has the same magnetic moment?