Question

The number of unpaired electrons in \([CoF_6]^{3-}\) is:

• A. one
• B. four
• C. zero
• D. two
• E. three

Hint:

Weak field ligands do not cause electron pairing, leading to a higher number of unpaired electrons in the d-orbital.

Answer 1

The Correct Option is B

In \([CoF_6]^{3-}\), cobalt is in the +3 oxidation state, which corresponds to a \(3d^6\) electron configuration. Since fluoride is a weak field ligand, it does not induce strong electron pairing. The electrons remain unpaired, leading to a total of four unpaired electrons.