What is the oxidation state of $Fe$ in $Fe(CO)_5$?

The $IUPAC$ name of the coordination compound $[Co(NH_3)_3NO_2ClCN]$ is:

What is the $IUPAC$ name of the complex $[Co(NH_3)_4 Cl_2]Cl$?

$IUPAC$ name of $H_2[PtCl_6]$ is

Write the formulas for the following coordination compounds:
$(i)$ Tetraamminediaquacobalt$(III)$ chloride
$(ii)$ Potassium tetracyanidonickelate$(II)$
$(iii)$ Tris(ethane$-1,2-$diamine)chromium$(III)$ chloride
$(iv)$ Amminebromidochloridonitrito$-N-$platinate$(II)$
$(v)$ Dichloridobis(ethane$-1,2-$diamine)platinum$(IV)$ nitrate
$(vi)$ Iron$(III)$ hexacyanidoferrate$(II)$

The $IUPAC$ name of $(CO)_3Fe(\mu-CO)_3Fe(CO)_3$ is ........