Give an example of a reaction which represents reduction.

The reduction can be considered as the removal of oxygen, the addition of hydrogen, or the gain of electrons.


  • The H+ ions, with an oxidation number of +1, are reduced to H2, with an oxidation number of 0, in the reaction:

Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)

  • Another example is the reaction that extracts iron from iron ore:

Fe2O3 + 3CO → 2Fe + 3 CO2

The iron oxide undergoes reduction (loses oxygen) to form iron while the carbon monoxide is oxidized (gains oxygen) to form carbon dioxide.

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