A) \[{{[Co{{F}_{6}}]}^{3-}}\]
B) \[{{[Co{{(N{{H}_{3}})}_{6}}]}^{3+}}\]
C) \[{{[Fe{{(CN)}_{6}}]}^{3-}}\]
D) \[{{[Cr{{(N{{H}_{3}})}_{6}}]}^{3+}}\]
Correct Answer: A
Solution :
\[{{F}^{-}}\]being a weak field ligand, is not able to cause pairing. Thus,\[(n-1)\]d-orbitals of Co metal are not available for ligand\[({{F}^{-}})\]and hence, ligands occupy outer d-orbital (nd orbitals) resulting to\[s{{p}^{3}}{{d}^{2}}\]hybridisation.
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