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The oxidized substance is called a reduction agent. The reduced substance is called an oxidizing agent.
(i) 4Na(s) + O2(g) → 2Na2O(s)
Oxidized substance – Na
Reduced substance – O2
In the first equation sodium (Na) is getting oxidized with the addition of Oxygen (O2).
(ii) CuO(s) + H2(g) → Cu(s) + H2O(l)
Oxidized substance – H2
Reduced substance – CuO
In the second equation copper (Cu) is reduced due to the addition of Hydrogen (H2).
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