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

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