Question

The anion $\left[Co\left(C_{2}O_{4}\right)_{3}\right]^{3-}$ involves hybridization

• A. $sp^{3} d^{2}$
• B. $d^{2} sp^{3}$
• C. $sp^{2} d^{3}$
• D. $d^{3} sp^{2}$

Answer 1

Answer: (A)

Oxidation number of $Co$ in $\left[Co \left(C_{2}O_{4}\right)_{3}\right]^{3-} = + 3$

$Co^{3+} \left(Z = 27\right) 3d^{6}$

Since $C_{2}O^{2-}_{4}$ is a weak field ligand it does not force electrons to pair up

$\therefore \left[Co\left(C_{2}O_{4}\right)_{3}\right]^{3-}:$