Types of isomerism shown by `[Cr(NH_3)_5NO_2]Cl_2` is

What type of isomerism is shown by [Co(NH_3)_4Cl_2]^(+) . Write the possible structures and state of hybridization of the central metal atom.

Which type of isomerism is shown by [Co(NH_(3))_(4)Br_(2)]Cl

Which type pf isomerism is shown by [Co (NH_3)_5 ONO]^(2-) and [CO (NH_3)_5 NO_2]^2+ ?