Which of these is a combustion and synthesis reaction? a. ch4 + 2 o2 → co2 + 2 h2o b. mg + o2 → mgo c. h2o → h2 + o2 d. cao → ca + o2

A is the correct answer. A combustion reaction creates carbon dioxide and water. A is the only answer choice were carbon dioxide and water are made.

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Bthe s the