Question

$\left[Co\right(C_2{O}_4{)}_3{]}^{3-}$ is a diamagnetic complex because ?

• A. $C_2{O}_4^{2-}$ is strong field ligand hence causes pairing of electrons
• B. $C_2{O}_4^{2-}$ is a bidentate ligand hence causes pairing of electrons
• C. $Co$ is a strong central atom hence in all complexes of Co electrons are paired
• D. $C_2{O}_4^{2-}$ is a strong field ligand hence causes splitting of d-orbitals.

Answer 1

The correct option is A $C_2{O}_4^{2-}$ is strong field ligand hence causes pairing of electrons

$\left[Co\right(C_2{O}_4{)}_3{]}^{3+}\Rightarrow C{o}^{3+}\Rightarrow \left[Ar\right]3d^6$

$C_2{O}_4^{2-}\to$ Strong field ligand.

So Diamagnetic.