1. 2NO + O₂ → 2NO₂
2. CH₄ + 2O₂ → CO₂ + 2H₂O
3. 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂ ↑
4. Fe₂O₃ + 6HCl → 2FeCl₃ + 3H₂O
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Answers & Comments
1. 2NO + O₂ → 2NO₂
2. CH₄ + 2O₂ → CO₂ + 2H₂O
3. 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂ ↑
4. Fe₂O₃ + 6HCl → 2FeCl₃ + 3H₂O