Which of the following is an oxidation-reduction reaction?
Ba(C2H3O2)2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaC2H3O2 (aq)
H2CO3 (aq) + Ca(NO3)2 (aq) → 2HNO3 (aq) + CaCO3 (s)
Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu(NO3)2 (aq)
AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3 (aq)
HCl (aq) + NaOH (aq) → H2O (l) + NaCl (aq)
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