Question

For a tetrahedral complex ${\left[{MCl}_4\right]}^{2-}$, the spin-only magnetic moment is $3.83$ BM. The element $M$ is:

• A. $Co$
• B. $Cu$
• C. $Mn$
• D. $Fe$

Answer 1

Answer: (A)

$Co$

3.83 BM magnetic moment correspond to 3 unpaired electrons and metal M is present in +2 oxidation state which is possible only when the metal is $Co$ as cobalt have three unpaired electrons in its +2 oxidation state.