KMnO4 has different equivalent weights in acid, neutral or alkaline medium. — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Rusting of iron is an electrochemical process occurring in the presence of water and oxygen. Step 2: Iron is oxidized to Fe^2+ and then to Fe^3+, which ultimately precipitates as a hydrated form of iron(III) oxide. Step 3: The chemical composition of rust is hydrated iron(III) oxide, represented as Fe2O3.xH2O, which corresponds to option (c).