Final answer:
The given reaction 2Mg + O₂ → 2MgO is a combination reaction in chemistry.
Step-by-step explanation:
In the given reaction 2Mg(s) + O₂(g) → 2MgO(s), it is a combination reaction.
A combination reaction is a type of chemical reaction where two or more substances combine to form a single substance. In this case, magnesium (Mg) and oxygen (O₂) react to form magnesium oxide (MgO). The reaction can be represented as 2Mg(s) + O₂(g) → 2MgO(s).
This is an example of a redox reaction where magnesium is oxidized and oxygen is reduced.