Which among the following complexes can be named “dichlorido-bis-(ethane-$1, 2$-diamine)-platinum$(IV)$ nitrate"?

The charge on cobalt in $[Co(CN)_6]^{3-}$ is

The $IUPAC$ name of the compound $(NH_4)_2[Ni(C_2O_4)_2(H_2O)_2]$ is

The molecular formula of tetraammineaquachloridocobalt$(III)$ chloride is . . . . . . .

The $IUPAC$ name for the complex $[Co(NO_2)(NH_3)_5]Cl_2$ is :

Using $IUPAC$ norms,write the formulas for the following:
$(i)$ Tetrahydroxozincate $(II)$
$(ii)$ Potassium tetrachloridopalladate $(II)$
$(iii)$ Diamminedichloridoplatinum $(II)$
$(iv)$ Potassium tetracyanonickelate $(II)$
$(v)$ Pentaamminenitrito$-O$-cobalt $(III)$
$(vi)$ Hexaamminecobalt $(III)$ sulphate
$(vii)$ Potassium tri(oxalato)chromate $(III)$
$(viii)$ Hexaammineplatinum $(IV)$
$(ix)$ Tetrabromidocuprate $(II)$
$(x)$ Pentaamminenitrito$-N$-cobalt $(III)$