alleryWhich of these octahedral complexes is diamagnetic?
A[Co(C₂O₄)₃]³⁻
B[CoF₆]³⁻
C[MnCl₆]³⁻
D[FeF₆]³⁻
Answer & Solution
Correct answer: A. [Co(C₂O₄)₃]³⁻
In the oxalato complex the six d electrons of Co³⁺ are fully paired in a d²sp³ inner orbital arrangement.
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