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Step-by-step solution

[ Co ( NH ₃ )₆ ]³⁺:- NH ₃ is a strong field ligand and a neutral ligand. Thus, Co exists as Co ³⁺ with paired electrons. Thus, Co ³⁺=3 ~d ^6 or t _ 2 ~g ^6 e _ g ^0 [ CoF ₆ ]³⁻:- F ⁻ is a weak field ligand and uninegatively charged. Thus, Co exists as Co ³⁺ with some unpaired electrons. Thus, Co ³⁺=3 ~d ^6 or t _ 2 ~g ^4 e _ g ^2 [ Ni ( CO )₄ ] :- CO is a strong field and a neutral ligand. Thus, Ni is in 0 oxidation state with all paired electrons. Thus, Ni =3 ~d ^8 4 ~s ^2 or t ₂^4 e ^6 (outer orbitals) [ Fe ( CN