Which among the following is a displacement reaction?
1) Na + Cl2 → NaCl
2) Zn + Cu SO4 → Zn SO4 + Cu
3) 2H2 + O2 → 2H2O
4) Mg(OH)2 + 2HCl → MgCl2 + 2H2O
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it's the fourth one [Mg(OH)2 + 2HCl → MgCl2 + 2H2O]
because displacement is taking place there.
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