Which of the following are combustion reactions? 1) CH4(g) … Questions Which оf the fоllоwing аre combustion reаctions? 1) CH4(g) + O2(g) → CO2(g) + H2O(l) 2) CаO(s) + CO2(g) → CaCO3(s) 3) PbCO3(s) → PbO(s) + CO2(g) 4) CH3OH(l) + O2(g) → CO2(g) + H2O(l) Show Answer Hide Answer