Which of the following are decomposition reactions? *
1. CH4 (g) + O2(g) → CO2 (g) + H20 (1)
2. Cao (s) + CO2(g) → CaCO3 (s)
3. Mg (s) + O2 (g) – Mgo (s)
4. POCO3 (s) – Pbo (s) + CO> (9)

4

Explanation:

Starts with a compound and breaks down.

- Hope that helped! Please let me know if you need a further explanation.

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it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter