The sum of oxidation states of two silver ions in $[Ag(NH_{3})_{2}][Ag(CN)_{2}]$ complex 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 compound $K_3[Fe(CN)_6]$ is named as:
$(1)$ Potassium hexacyanoferrate $(II)$
$(2)$ Potassium hexacyanoferrate $(III)$
$(3)$ Potassium ferricyanide
$(4)$ Hexacyanoferrate $(III)$ potassium

State the rules for the nomenclature of mononuclear coordination compounds.

The $IUPAC$ name for the complex $[Co(NO_2)(NH_3)_5]Cl_2$ is :

Identify the formula of Bis(ethylenediamine)dithiocyanatoplatinum$(IV)$.