When steam is passed over red hot iron, the substances formed are : — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Passing steam over red-hot iron leads to a high-temperature reversible redox reaction. Step 2: Iron is oxidized by water vapor to magnetic iron oxide (Fe3O4, which is a mixed FeO.Fe2O3 oxide) while water is reduced to hydrogen gas. Step 3: The balanced equation for this process is: 3Fe + 4H2O(g) -> Fe3O4 + 4H2. This corresponds to the formation of Fe3O4 and H2, matching option (c).