Question 65 of 66
Q.Distinguish between Oxidation and Reduction.
Tamil Nadu DgeTamil Nadu HSC First Year (DGE) Board 2026Subjective· 2mImportance★★★★★est
98% · 65/66 Questions
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Start your 14-day free trial to unlock the full solution →We are asked to distinguish clearly between oxidation and reduction.
Oxidation is loss of electrons (oxidation number increases); reduction is gain of electrons (oxidation number decreases); the two always occur simultaneously.
Oxidation:
- Classical view: addition of oxygen or removal of hydrogen. Example: 2Mg + O2 → 2MgO (Mg is oxidised).
- Electronic view: loss of one or more electrons; the oxidation number increases. Example: Fe^2+ → Fe^3+ + e-.
Reduction:
- Classical view: removal of oxygen or addition of hydrogen. Example: CuO + H2 → Cu + H2O (CuO is reduced).
- Electronic view: gain of one or more electrons; the oxidation number decreases. Example: Cu^2+ + 2e- → Cu. …
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