or
$\operatorname{trans}-\left[ Co \left( NH _{3}\right)_{4} Cl _{2}\right] C \ell$
As we know that ethylene diamine is a bidentate ligand and ammonia is a mono dentate ligand.
It means overall two ethylene diamine is required to replace the all neutral ligands (four ammonia) from the coordination sphere of this complex.
$5 {Fe}^{2+}+{MnO}_{4}^{-}+8 {H}^{+} \rightarrow {Mn}^{2+}+4 {H}_{2} {O}+5 {Fe}^{3+}$
(પરમાણુ ક્રમાંક $Cr = 24, Mn = 25, $$Fe = 26, Ni = 28$)
$(I)$ $K[Co(NH_3)_2(NO_2)_4$ $(II)$ $[Cr(NH_3)_3(NO_2)_3]$ $(III)$ $[Cr(NH_3)_5NO_2]_3[CO(NO_2)_6]_2$ $(IV)$ $Mg[Cr(NH_3) (NO_2)_5]$