Consider the following isomerisms:
$1.$ Ionization
$2.$ Hydrate
$3.$ Linkage
$4.$ Geometrical
$5.$ Optical
Which isomerisms are exhibited by $[Cr(NH_3)_2(OH)_2Cl_2]^-$?

Select the correct statement$(s)$ regarding the $[Ni(DMG)_2]$ complex compound.

The pair in which both the species have the same magnetic moment (spin only) is :

An octahedral complex having molecular composition $Co \cdot 5NH_3 \cdot Cl \cdot SO_4$ has two isomers $A$ and $B$. The solution of $A$ gives a white precipitate with $AgNO_3$ solution and the solution of $B$ gives a white precipitate with $BaCl_2$ solution. The type of isomerism exhibited by the complex is,

Total number of geometrical isomers of $[Ma_3b_3]$ is/are:

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