Which of the following are oxidation-reduction reactions?
a. BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq)
b. Cl2(g) + 2NaBr(aq) → Br2(l) + 2NaCl(aq)
c. 2KClO3(s) → 2KCl(s) + 3O2(g)
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