The brown ring complex compound is formulated as $[Fe(H_2O)_5NO]SO_4$. The oxidation state of iron is

The $IUPAC$ name of $Xe[PtF_6]$ is

Provide the $\text{IUPAC}$ nomenclature for the following coordination compounds:
$(i)$ $[Cr(NH_3)_3(H_2O)_3]Cl_3$
$(ii)$ $[Co(en)_3]_2(SO_4)_3$
$(iii)$ $[Ag(NH_3)_2][Ag(CN)_2]$
$(iv)$ $Na_3[Cr(C_2O_4)_3]$

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 $(III)$

Which of the following is a wrong statement?

The $I.U.P.A.C.$ name of ${K_3}[Ir({C_2}{O_4})_3]$ is