Answer:
Mg.
Explanation:
- The reducing agent is the agent that is oxidized (losses electrons).
- The oxidizing agent is the agent that is reduced (gains electrons).
For the mentioned reaction:
2Mg + O₂ → 2MgO.
Mg (oxid. no. = 0) is converted to MgO (oxid. no. of Mg = +2), which means that Mg losses 2 electrons and is oxidized.
So, the reducing agent is Mg.
