Explain the following in terms of gain or loss of oxygen with two examples each .
(a) Oxidation (b) Reduction

Explanation

Oxidation reaction : It is a chemical reaction in which gain of oxygen or loss of hydrogen takes place ,br> (1) `2Mg(s)+O_(2)(g) overset("heat") to 2MgO(s)`
Here, Magnesium is oxidised to become Magnesium oxide.
(2) `2Cu(s)+O_(2)(g) overset("heat") to 2CuO(s)`
Here, copper is oxidised to become copper oxide.
Reduction reaction : It is chemical reaction in which loss of oxygen or gain of hydrogen takes place.
(1) `CuO+H_(2) overset("Heat") to Cu+H_(2)O`
here, copper oxide is reduced to become copper.
`ZnO+C overset("Heat") to Zn +CO`, here zinc oxide is reduced to become Zinc.