Identify the oxidation state of the cobalt ion in the complex $[Co(NH_3)_5Br]SO_4$.

The $IUPAC$ name of $[Cr(NH_3)_6]^{3+}$ is

The $IUPAC$ name of $K_3[Ir(C_2O_4)_3]$ is $....$.

State the $IUPAC$ name of the following complex: $Cis-platin$.

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 $(III)$

$IUPAC$ name of $[Pt(NH_3)_3(Br)(NO_2)Cl]Cl$ is