H2 + O2= Fe203 + H2 = Mn0 +H2 = FeO +H2 =

The reactions you've mentioned involve the combination of hydrogen with various oxides and metals. Here are the balanced equations for each reaction: 1. **H₂ + O₂ → H₂O** This is the combustion of hydrogen to produce water. 2. **Fe₂O₃ + H₂ → 2 Fe + 3 H₂O** This is the reduction of iron(III) oxide (hematite) by hydrogen gas, producing iron and water. 3. **MnO + H₂ → Mn + H₂O** This is the reduction of manganese(II) oxide by hydrogen, resulting in manganese and water. 4. **FeO + H₂ → Fe + H₂O** This is the reduction of iron(II) oxide (wüstite) by hydrogen, yielding iron and water. In each of these reactions, hydrogen acts as a reducing agent, converting the metal oxides to their respective metals while producing water as a byproduct.