The reaction is an oxidation process and the product is a solid (usually a powder).
Your question doesn't make much sense as worded. Reactions are not formed, they happen. Products are formed.
WHAT TYPE OF CHEMICAL REACTION IS FORMED FROM Mg + O2----MgO
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You may be looking for the word "synthesis." 2Mg + O2 ==> 2MgO is a synthesis reaction.
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