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Ответ:

а) 4Al + 3O₂ → 2Al₂O₃,

Mg + 2HCl → MgCl₂ + H₂,

2SO₂ + O₂  → 2SO₃,

2Fe₂O₃ + 3C → 4Fe + 3CO₂,

2K + S → K₂S;

c) 2Al + 3S → Al₂S₃,

Ca + 2HCl → CaCl₂ + H₂,

Al₂O₃ + 3H₂ → 2Al + 3H₂O,

2K + Cl₂ → 2KCl,

4P + 5O₂ → 2P₂O₅.