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Explain the following in terms of gain or loss of oxygen with two examples each:
(a) Oxidation and
(b) Reduction
The simplest way of understanding oxidation and reduction is in terms of the gain and loss of oxygen. Oxidation is the gain of oxygen and Reduction is the loss of oxygen.
(a) Oxidation: It is the process of loss of electrons or an increase in oxidation state by a molecule, atom, or ion.
(i) $2Cu + O_2 → 2CuO$
(ii) $4Al + 3O_2 → 2Al_2O_3$
(b) Reduction: It is the process of gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.
(i) $CuO + H_2 → Cu + H_2O$
In the above reaction, oxygen is removed from copper oxide so a reduction of CuO occurs.
(ii) $ZnO\ +\ C\ \xrightarrow{\ Heat} \ Zn\ +\ CO$
In the above reaction, Oxygen is removed from Zinc oxide. By definition, the removal of oxygen from a compound is called reduction, so, we can say that Zinc oxide is reduced to Zinc.
Updated on: 14-Mar-2023
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