The oxidation state of iron in $Na_{4}[Fe(CN)_{5}(NOS)]$ is

Provide the $\text{IUPAC}$ names for the following coordination compounds:
$(i)$ ${K_2}[Zn(Cl)_4]$
$(ii)$ ${K_4}[Fe(CN)_6]$
$(iii)$ $[Co(NH_3)_4Cl_2]Cl$
$(iv)$ $[Fe(NH_3)_6]^{3+}$

The formula for the complex chlorodiaquatriaamminecobalt $(III)$ chloride is ...................

The name of the compound $[Ag(NH_3)_2][Ag(CN)_2]$ is

The sum of oxidation states of two silver ions in $[Ag(NH_{3})_{2}][Ag(CN)_{2}]$ complex is $....$ .

The oxidation number of sulphur in $H_2S_2O_7$ and iron in $K_4[Fe(CN)_6]$ is respectively: