1. MgO + 2HCl = MgCl₂ + HCl
2. MgCl₂ + Na₂CO₃ = MgCO₃↓ + 2NaCl
3. MgCO₃ + 2NaCl = MgCl₂ + Na₂CO₃
4. 3MgCl₂ + 2Na₃PO₄ = Mg₃(PO₄)₂↓ + 6NaCl
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Answers & Comments
1. MgO + 2HCl = MgCl₂ + HCl
2. MgCl₂ + Na₂CO₃ = MgCO₃↓ + 2NaCl
3. MgCO₃ + 2NaCl = MgCl₂ + Na₂CO₃
4. 3MgCl₂ + 2Na₃PO₄ = Mg₃(PO₄)₂↓ + 6NaCl