Knowing that the fluoride ion is a weak field ligand and that the[CoF6]4- comple
ID: 681764 • Letter: K
Question
Knowing that the fluoride ion is a weak field ligand and that the[CoF6]4- complex ion is octahedral, which of the followingstatements is correct about the magnetic properties of this complexion?A. It is diamagnetic B. It is paramagnetic, with one unpaired electron C. It is paramagnetic with two unpaired electrons D. It is paramagnetic with three unpaired electrons E. None of the statements are true
A. It is diamagnetic B. It is paramagnetic, with one unpaired electron C. It is paramagnetic with two unpaired electrons D. It is paramagnetic with three unpaired electrons E. None of the statements are true
Explanation / Answer
Information shows Co to be in the 2+ state with 7 electrons distributed between the available d orbitals. Since the ligand field splitting is small, the 5 d orbitals are degenerate or equal in energy. We use Hund's rule to distribute the 7 electrons into the d orbitals and get 3 electrons which are unpaired. Thus, D is the answer.
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