Which of the following compounds has the same oxidation state of the central metal atom in both the cationic and anionic parts?

The $IUPAC$ name of $Na_3[Co(ONO)_6]$ is:

Using $IUPAC$ norms,write the systematic names of the following:
$(i)$ $[Co(NH_3)_6]Cl_3$
$(ii)$ $[Pt(NH_3)_2Cl(NH_2CH_3)]Cl$
$(iii)$ $[Ti(H_2O)_6]^{3+}$
$(iv)$ $[Co(NH_3)_4Cl(NO_2)]Cl$
$(v)$ $[Mn(H_2O)_6]^{2+}$
$(vi)$ $[NiCl_4]^{2-}$
$(vii)$ $[Ni(NH_3)_6]Cl_2$
$(viii)$ $[Co(en)_3]^{3+}$
$(ix)$ $[Ni(CO)_4]$

The $IUPAC$ name of the complex shown below is $K_3[Co(ox)_3]$

Select the correct $I.U.P.A.C.$ name for $[Pt(NH_3)_4][PtCl_4]$

The $IUPAC$ name for $[Co(NH_3)_6] [Cr(CN)_6]$ is: