Is Mg + O2 --> MgO a combination reaction . If yes , why ? 

Dear Student
A combination reaction is a reaction where two or more elements or compounds combine to form a single product.
2Mg + O2  2MgO
Mg and O2 combines to form a single product MgO.
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Regards

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Yes, This is a chemical reaction because in this reaction two substances that is magnesium and oxygen are combined to form a single product that is magnesium oxide. Also, with the release of energy.
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Combination reaction*
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