In the Brown ring complex $[Fe(H_2O)_5NO]SO_4$,the primary valency (oxidation state) of $Fe$ is:

The formula of the complex $Tris(ethylenediamine)cobalt(III)$ sulphate is:

Oxidation state of $Fe$ in $K_3[Fe(CN)_6]$

What is the correct $IUPAC$ name of the coordination compound $\text{Hg[Co(SCN)}_4]$?

What is the oxidation state of $Fe$ in ${K_3}[Fe(CN)_6]$?

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$(II)$