In the given reaction, Fe (metallic iron) is reacting with O2 (oxygen gas) to form Fe3+ (ferrous ion) and O2- (oxide ion).

Option 1: It is a redox reaction. This statement is correct because a redox reaction involves both oxidation and reduction processes. In this reaction, Fe is oxidized to Fe3+ (losing electrons) while O2 is reduced to O2- (gaining electrons).

Option 2: Metallic iron acts as a reducing agent. This statement is correct because a reducing agent is a substance that donates electrons and causes another species to be reduced. In this case, metallic iron donates electrons to oxygen, causing it to be reduced.

Option 3: O2 acts as an oxidizing agent. This statement is correct because an oxidizing agent is a substance that accepts electrons and causes another species to be oxidized. In this case, O2 accepts electrons from iron, causing it to be oxidized.

Option 4: Metallic iron is reduced to Fe3+. This statement is incorrect. In the given reaction, metallic iron is actually oxidized to Fe3+ (not reduced). The correct statement would be that metallic iron is oxidized to Fe3+