1. CaCO₃ = CaO + CO₂↑
2. SO₂ + Na₂O = Na₂SO₃
3. ZnSO₄ + 2NaOH = Zn(OH)₂↓ + Na₂SO₄
4. 2KOH + H₂SO₄ = K₂SO₄ + 2H₂O
5. BaCl₂ + Na₂SO₄ = BaSO₄↓ + 2NaCl
6. Hg(NO₃)₂ + Na₂S = 2NaNO₃ + HgS↓
7. 3K₂SO₃ + 2H₃PO₄ = 2K₃PO₄ + 3SO₂↑ + 3H₂O
8. 2Fe(OH)₃ = Fe₂O₃ + 3H₂O