Chemistry - Coordination Chemistry Question with Solution | TestHub

Solution:

The complex is $\left[\mathrm{Co}\left({\mathrm{NO}}_2\right){\left({\mathrm{NH}}_3\right)}_5\right]{\mathrm{Cl}}_2$.

Ligands: pentaammine (${\mathrm{NH}}_3$) and nitrito-N (${\mathrm{NO}}_2^{-}$).

Charge of complex ion: $+2$ (from $2\times {\mathrm{Cl}}^{-}$).

Oxidation state of Co: $x+(-1)+0=+2⟹x=+3$.

Naming: Ligands alphabetically (ammine before nitrito), then metal, then oxidation state.

Concepts: IUPAC nomenclature, ligand naming, oxidation states.