Write down the reaction equations Fe → Fe3O4 → Fe → FeCl3 → Fe (OH) 3 → Fe2O3 → Fe (NO3) 3

1) 3Fe + 4H2O = Fe3O4 + 4H2 (when iron interacts with water, iron (II, III) oxide and hydrogen are formed);

2) Fe3O4 + 8HCl = FeCl2 + 2FeCl3 + 4H2O (when iron (II, III) oxide interacts with hydrochloric acid, iron (II) chloride, iron (III) chloride and water are formed);

3) FeCl3 + 3NaOH = Fe (OH) 3 + 3NaCl (when iron (III) chloride interacts with sodium hydroxide, iron (III) hydroxide is formed with sodium chloride);

4) 2Fe (OH) 3 = Fe2O3 + 3H2O (upon decomposition of iron hydroxide, iron oxide and water are formed);

5) Fe2O3 + 6HNO3 = 2Fe (NO3) 3 + 3H2O (when iron oxide interacts with nitric acid, iron nitrate and water are formed).