AIIMS 2019 Chemistry Hybridization MCQ Question

In the coordination complex [Co(C₂O₄)₃]³⁻, Co³⁺ exhibits a d²sp³ hybridization due to its strong field ligand, oxalate (C₂O₄²⁻), which causes pairing of electrons in the lower energy d-orbitals, resulting in a low spin complex that is diamagnetic. This pairing leads to all electrons being paired, confirming the complex's diamagnetic nature. Other options are not applicable as they do not provide relevant information regarding the hybridization or magnetic properties of the complex. Understanding the influence of ligand field strength on electron configuration is crucial in predicting the magnetic properties of coordination compounds.