Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Explain the following in terms of gain of oxygen with two examples each.
(a) Oxidation
(b) Reduction

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> (a) In a chemical reaction, when the oxygen is added to the element to form its respective oxide it is the element being oxidised. Example:
$4Na+O_2\to 2N{a}_{2}O$
$H_{2}S+O_2\to H_{2}O+S{O}_2$

(b) In a chemical reaction, when the oxygen is being removed from the compound then it is said to be reduced. Example:
$CuO\left(s\right)+H_2\left(g\right)\to Cu\left(s\right)+H_{2}O$
$2HgO\to 2Hg+O_2$