The magnetic moment (spin only) of $[NiCl_{4}]^{2-}$ is ....... $B.M.$

Arrange the following in the increasing order of their magnetic moments:
$I.$ $[Mn(CN)_6]^{3-}$
$II.$ $[MnCl_6]^{3-}$
$III.$ $[Fe(CN)_6]^{3-}$
$IV.$ $[FeF_6]^{3-}$

Which of the following species shows the maximum magnetic moment?

The total number of stereoisomers for the complex $[Cr(ox)_2ClBr]^{3-}$ (where $ox$ = oxalate) is:

The number of geometric isomers possible for the complex $[CoL_2 Cl_2]^{-}$ where $L = H_2NCH_2CH_2O^{-}$ is

$Cis-trans$ isomerism is found in square planar complexes of the molecular formula: ($A$ and $B$ are monodentate ligands):