Which of the Following Are Combination Reactions? 1) CH₄ (G)

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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