When the oxidation number of an element decreases over the course of a reaction, that element has beenWhich of the following chemical reactions is an oxidation-reduction reaction?
CuSO4 + BaCl2 yields BaSO4 + CuCl2
AgNO3 + NaCl yields AgCl + NaNO3
Pb (NO3) 2 + 2NaCl yields PbCl2 + 2NaNO3
Zn + H2SO4 yields ZnSO4 + H2
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