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MgO + 2HCl → MgCl₂ + H₂O
MgO + H₂O → Mg(OH)₂
MgCl₂ + 2KOH → Mg(OH)₂ + 2KCl
MgCl₂ + Na₂CO₃ → MgCO₃ ↓+ 2NaCl
b) .4Al + 3O₂ → 2Al₂O₃
Al₂O₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂O
Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O
Al₂(SO₄)₃ + 6KOH → 2Al(OH)₃ + 3K₂SO₄
Al₂(SO₄)₃ + 2Na₃PO₄ →2AlPO₄↓ + 3Na₂SO₄
Al(OH)₃ + 3HCl → AlCl₃ + 3H₂O
c) .S + O₂ → SO₂
SO₂ + H₂O → H₂SO₃
2SO₂ + O₂ →2 SO₃
SO₃ + H₂O → H₂SO₄
d) .2Ca + O₂ → 2CaO
CaO + H₂O → Ca(OH)₂
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
e) .2K + H₂O → 2KOH + H₂
2KOH + H₂SO₄ → K₂SO₄ + 2H₂O
f) .4P + 5O₂ → 2P₂O₅
P₂O₅ + 3 H₂O → 2H₃PO₄
2H₃PO₄ +3 Na₂O → 2Na₃PO₄ + 3H₂O