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Question

Identify the oxidized and reduced compound in the given reaction CuO(s)Copperoxide+H2(g)HydrogengasCu(s)Copper+H2O(l)Water


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Solution

Oxidized and reduced substances:

  1. Oxidized compounds are those whose oxidation number increases, or they gain oxygen in a process, or they lose electrons or electronegative species combine with them in a reaction.
  2. Reduced substances are those whose oxidation number lowers, meaning they lose oxygen or gain electrons, or electropositive species join with them in a reaction.
  3. The oxidation number of copper changes from +2 to0. Also, the oxygen atom is removed from copper oxide. Therefore copper oxide is reduced here. CuO(s)Copperoxide+2Cu(s)0Copper
  4. Hydrogen gas is oxidized here as an oxygen atom is added to it. Also, the oxidation number of hydrogen changes from 0 to+1.

Therefore, in the given reaction oxidized substance is hydrogen and the reduced substance is copper oxide.


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