Oxides: FeO – iron (II) oxide.
Salts: FeSO4 – iron (II) sulfate; FeCl2 – iron (II) chloride.
Hydroxides: Fe (OH) 2 – iron (II) hydroxide.
Fe is a simple substance, metal.
1. Iron (II) oxide, reacting with sulfuric acid, form iron (II) sulfate and water.
FeO + H2SO4 = FeSO4 + H2O.
2. The product of the reaction between ferrous sulfate and sodium hydroxide is iron (II) hydroxide and sodium sulfate.
FeSO4 + 2NaOH = Fe (OH) 2 ↓ + Na2SO4.
4. When heated, iron hydroxide decomposes to iron (II) oxide and water.
Fe (OH) 2 → FeO + H2O.
5. Iron (II) oxide is reduced by hydrogen to iron.
FeO + H2 = Fe + H2O.
6. Iron, reacting with hydrochloric acid, forms iron (II) chloride and hydrogen.
Fe + 2HCl = FeCl2 + H2.
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