Last Updated: 24 March 2026Verified for JEE 2026
ChemistryJEE & NEET
Difference Between Oxidation and Reduction
Oxidation and reduction are complementary chemical processes that always occur together (redox reactions). Oxidation involves loss of electrons, while reduction involves gain of electrons.
Oxidation vs Reduction — Comparison Table
| Aspect | Oxidation | Reduction |
|---|---|---|
| Definition | Loss of electrons | Gain of electrons |
| Oxidation number | Increases | Decreases |
| Oxygen | Gain of oxygen | Loss of oxygen |
| Hydrogen | Loss of hydrogen | Gain of hydrogen |
| Agent | Reducing agent gets oxidized | Oxidizing agent gets reduced |
| Example | Na → Na⁺ + e⁻ | Cl₂ + 2e⁻ → 2Cl⁻ |
| Mnemonic | OIL (Oxidation Is Loss) | RIG (Reduction Is Gain) |
Key Points to Remember
Remember: OIL RIG — Oxidation Is Loss, Reduction Is Gain
In electrochemical cells: oxidation at anode, reduction at cathode
Oxidizing agents accept electrons (get reduced themselves)
Common oxidizing agents: KMnO₄, K₂Cr₂O₇, HNO₃, O₂
Exam Relevance
This topic falls under Redox Reactions in Chemistry for both JEE and NEET. Questions on the difference between oxidation and reduction appear frequently in competitive exams, both as direct MCQs and as part of numerical/assertion-reason problems.
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