Which of the Following Are Decomposition Reactions?
1 $\rightarrow$ CO₂ (G) + H₂O (L)
2

Multiple Choice

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

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