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Oxidation refers to the loss of hydrogen.
Reduction refers to the addition of oxygen.
Cl₂ is oxidized in the reaction with H₂S(g) because it gains hydrogen.
H₂(g) + CuO(s) → H₂O(l) + Cu(s)
In the chemical eaction above, CuO acts as a reducing agent in the reaction with H₂(g).
In the reaction between H₂(g) and CuO(p)
H₂(g) + CuO(s) → H₂O(l) + Cu(s)
H₂ functions as an oxidizing agent.