Explain the following in terms of the gain of oxygen with two examples each.
ScienceClass 10CBSEAnswered 27 Mar 2026
Answer
(a) Oxidation
(b) Reduction
Solution:
(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(s) + O2(g) → 2Na2O(s)
H2S + O2 → H2O + SO2
(b) In a chemical reaction, when the oxygen is removed from the compound, then it is said to be reduced. Example:
CuO(s) + H2(g) → Cu(s) + H2O(l)
2HgO → 2Hg + O2
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