Question

Coordination number of $Cr$ is six. A complex with $C_2{O}_4^{2-}$, en and superoxide $O_2^{-}$ will be in the ratio to make complex $\left[Cr\right(C_2{O}_4{)}_x\left(en{)}_y\right(O_2{)}_z{]}^{-}$ :

• A. $x=1,y=1,z=1$
• B. $x=1,y=1,z=2$
• C. $x=1,y=2,z=2$
• D. $x=2,y=1,z=1$

Answer 1

The correct option is B $x=1,y=1,z=2$

As co-ordination of $Cr$ is 6

$C_2{O}_4^{2-}$ & en are bidentate ligands while $O_2^{-}$ is unidentate

so $x=1,y=1,z=2$
$\left[Cr\right(C_2{O}_4{)}_1\left(en{)}_1\right(O_2{)}_2{]}^{-}$