Consider the coordination complex [ CoF ₆ ]³⁻ and the following statements regarding its properties: (I) It is an inner orbital complex. (II) Its spin-only magnetic moment is approximately 4.90 BM . (III) Its crystal field stabilization energy (CFSE) is -0.4 _ o . (IV) It is a diamagnetic complex. How many of the above statements are correct?

Step-by-step solution

The given complex is [ CoF ₆ ]³⁻ . The central metal ion is Co ³⁺ , which has a 3 d ⁶ electronic configuration. Since F ⁻ is a weak field ligand, pairing of electrons does not occur prior to filling of e _ g orbitals ( _ o Statement (I) is incorrect: It uses outer 4 d orbitals for hybridization ( sp ³ d ² ), making it an outer orbital complex. Statement (II) is correct: With 4 unpaired electrons ( n=4 ), the spin-only magnetic moment is = 4(4+2) = 24 4.90 BM . Statement (III) is correct: CFSE = (-0.4 n_ t _ 2 g + 0