2Mg + O2 → 2MgO The above reaction is an example of ________ reaction.

The reaction 2Mg + O2 → 2MgO is a classic example of a combination reaction (also known as a synthesis reaction). In this reaction, two separate reactants—magnesium (Mg) and oxygen (O2)—combine to form a single, more complex product, magnesium oxide (MgO).