The $IUPAC$ name of $Na_3[Co(ONO)_6]$ is .....

The oxidation state of $Cr$ in $[Cr(NH_3)_4Cl_2]^+$ is

The correct formula of diammine dichlorodicyano chromate $(III)$ is

The correct $IUPAC$ name of potassium cuprochloride $(K_3[CuCl_4])$ 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 sum of oxidation states of two silver ions in $[Ag(NH_{3})_{2}][Ag(CN)_{2}]$ complex is $....$ .