The oxidation state of iron in $K_{4}[Fe(CN)_{6}]$ is

The $IUPAC$ name for $[(NH_3)_5Cr(OH)Cr(NH_3)_5]^{5+}$ is:

$X$ is the number of acidic oxides among $VO_2$,$V_2O_3$,$CrO_3$,$V_2O_5$ and $Mn_2O_7$. The primary valency of cobalt in $[Co(en)_3]_2(SO_4)_3$ is $Y$. The value of $X+Y$ is $:$

Pick the correct $IUPAC$ name of $[Co(NH_3)_5Cl]Cl_2$.

The $IUPAC$ name of ${K_2}[Cr(CN)_2(O_2)(O)_2(NH_3)]$ is

Find out the correct $IUPAC$ name of the complex compound $[Cr(NH_3)_5(CN)][Ir(NO_2)_6]$.