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10. Ca (OH)₂ + 2NH₄Cl ---> CaCl₂ + 2H₂O + 2NH₃

6. 4Al + 3O₂ --> 2Al₂O₃

4. 4NO₂ + 2H₂O + O₂ --> 4HNO₃

3. Fe + 2HCl --> FeCl₂ + H₂

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