Find the sum of the oxidation states of the central iron metal atoms in the complex ions and . — Electrochemistry Chemistry Question

💡 Solution & Explanation

Let the oxidation state of Fe be $y$. In $[Fe(CN)_6]^{4-}$, cyanide ($CN^-$) has a charge of $-1$. So, $y + 6(-1) = -4 \implies y = +2$. In $[Fe(CN)_6]^{3-}$, $y + 6(-1) = -3 \implies y = +3$. The sum of their oxidation states is $2 + 3 = 5$.