Question

A metal compound has the chemical formula $K_{3}\left[Fe \left(C_{2} O_{4}\right)_{3}\right]$ . Determine the oxidation number and coordination number, respectively.

• A. $+2and3$
• B. $+3and3$
• C. $+3and6$
• D. None of these.

Answer 1

Answer: (C)

$\ln \mathrm{K}_{3}\left[\mathrm{Fe}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right] ; $ Oxidation number of $\mathrm{Fe}=3+\mathrm{x}+3(-2)=0$
$x=+3$
$\mathrm{C}_{2} \mathrm{O}_{4}^{2-}$ is a bidentate ligand.
Coordination number of $\mathrm{Fe}=3(2)=6$