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Identify the oxidation-reduction reactions among the following:
1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
2. 2Na(s) + Cl2(aq) → 2NaCl(s)
3. 2Mg(s) + O2(g) → 2MgO
Identify the oxidation-reduction reactions among the following:
1 and 2 only
2 and 3 only
1 and 3 only
All of 1, 2, and 3
None of 1, 2, and 3
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