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Which of the following reactions is incorrectly represented?
1. Cu(s) + 2Ag+ (aq) → Cu2+(aq) + 2Ag(s)
2. Co(s) + Ni2+ → Co2+ (aq) + Ni(s)
3. Cu(s) + Zn2+(aq) → Cu2+(aq) + Zn(s)
4. 2Na(s) + Mg2+(aq) → Mg(s) + 2Na+(aq)
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Which of the following reactions is incorrectly represented?