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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)

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Which of the following are combination reactions? <br>1) CH<sub>4</sub> (g) + O<sub>2</sub> (g) . CO<sub>2</sub> (g) + H<sub>2</sub>O (l) 2) CaO (s) + CO<sub>2</sub> (g) . CaCO<sub>3</sub> (s) 3) Mg (s) + O<sub>2</sub> (g) . MgO (s) 4) PbCO<sub>3</sub> (s) . PbO (s) + CO<sub>2</sub> (g)






 
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