Chemistry - Coordination Chemistry Question with Solution | TestHub

Primary valency $=$ Oxidation state
Secondary valency $=$ Co-ordination number
$\begin{array}{llcc}& Complex& \begin{array}{l}\text{Primary}\\ \text{valency}\end{array}& \text{Secondary}\\ (A)& \left[\mathrm{Co}(\mathrm{en}{)}_2{\mathrm{Cl}}_2\right]\mathrm{Cl}& 3& 6\\ (B)& \left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2\mathrm{Cl}\left({\mathrm{NO}}_2\right)\right]& 2& 4\\ (C)& \mathrm{Hg}\left[\mathrm{Co}(\mathrm{SCN}{)}_4\right]& 3& 4\\ (D)& [\mathrm{Mg}(\mathrm{EDTA}){]}^{2-}& 2& 6\end{array}$