The ionization isomer of $[Cr(H_2O)_4Cl(NO_2)]Cl$ is

$[PdCl_2(PMe_3)_2]$ is a diamagnetic complex of $Pd(II)$. How many total isomers are possible for the analogous paramagnetic complex of $Ni(II)$?

Which of the following complexes exhibit geometrical isomerism?
$I$) $[Co(en)(NH_3)_2 Cl_2] Cl$
$II$) $[Co(NH_3)_4 Cl_2] Cl$
$III$) $[Co(en)_3] Cl_3$
$IV$) $[Co(en)_2 Cl_2] Br$

The complexes $[CO(NO_2)(NH_3)_5]Cl_2$ and $[CO(ONO)(NH_3)_5]Cl_2$ are examples of .....

The magnetic moment of the complex $[Ni(NH_3)_6]Cl_2$ is

Which of the following will exhibit optical activity?