Consider the following equation of the chemical reaction of a metal M:
$4 M + 3 O_{2} \underset{}{\to} 2 M_{2} O_{3}$
This equation represents:
(a) combination reaction as well as reduction reaction
(b) decomposition reaction as well as oxidation reaction
(c) oxidation reaction as well as displacement reaction
(d) combination reaction as well as oxidation reaction

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Solution

(d) combination reaction as well as oxidation reaction

In the above reaction, metal combines with the oxygen to form a single compound, so it is a combination reaction. Moreover, addition of oxygen takes place, so it is also a oxidation reaction.

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