Question

[Co(C2O4)3]*3- is a diamagnetic complex because...
(a) C2O4 2- is a strong field ligand hence causes pairing if electrons
(b) C2O4 2- is a bidentate ligand hence causes pairing of electrons
(c) Co3+is a strong central atom hence in all complexes of Co3+electrons are paired
(d) C2O4 2- is a strong field ligand hence causes splitting of d-orbitals

Answer 1

Welcome buddy,

● Answer -
(a) (C2O4)2- is a strong field ligand hence causes pairing if electrons

● Explanation -
- Magnetic character of a complex depends upon no of umpaired electrons present in the complex.
- Strong field ligands cause pairing of electrons and favors diamagnetic behavior.
- Weak field ligands don't cause pairing of electrons and favors paramagnetic behavior.
- As (C2O4)2- is strong field ligand, it causes pairing of electrons.
- Therefore, [Co(C2O4)3]*3- is diamagnetic.

Hope this helps you...