Thank you for reporting, we will resolve it shortly
Q.
In the complex $\left[\left(CoCl\right)_{2} \left( en \right)_{2}\right]Br$ , the co-ordination number and oxidation state of cobalt are:
NTA AbhyasNTA Abhyas 2022
Solution:
The given complex dissociate as follows:
$\left[\left(CoCl\right)_{2} \left(en\right)_{2}\right]Br \rightarrow \left[\left(CoCl\right)_{2} \left(en\right)_{2}\right]^{+}+\left(Br\right)^{-}$
Let $x$ be the oxidation state of cobalt in $\left[\left(CoCl\right)_{2} \left(en\right)_{2}\right]^{+}$ .
So, $x+2\left(- 1\right)+0=+1x=+3$ .
As there are six $\sigma $ bonds between cobalt and the ligands, its coordination number is $6$ (here $\_{}^{'}en_{}^{'}$ is a bidentate ligand).
