Which of the following is an oxidation-reduction reaction?
a. HCl (aq) + NaOH (aq) → H2O (l) + NaCl (aq)
b. Cu (s) + 2AgNO3 (aq) → Cu (NO3) 2 (aq) + 2Ag (s)
c. AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3 (aq)
d. 2 HCl (aq) + CaCO3 (s) → H2O (l) + CaCl2 (aq) + CO2 (g)
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