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2. Which balanced equation represents an oxidation-reduction reaction?
A) H3PO4 + 3KOH →K3PO4 + 3H20
B) NH3(g) + HCl(g) →NH4Cl(s)
C) Fe(s) + S(s) →FeS(s)
D) Ba(NO3)2 + Na2SO4 →BaSO4 + 2NaNO3