Which of the Following Are Combination Reactions

question 17

Multiple Choice

Which of the following are combination reactions?
1.CH₄ (g) + O₂ (g) → CO2 (g) + H2O (l)
2.CaO (s) + CO₂ (g) → CaCO₃ (s)
3.Mg (s) + O2(g) → MgO (s)
4.PbCO₃ (s) → PbO (s) + CO₂ (g)

• A) 1, 2, and 3
• B) 2 and 3
• C) 1, 2, 3, and 4
• D) 4 only
• E) 2, 3, and 4

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