Redox Reactions
Madhya Pradesh Board · Class 11 · Chemistry
Quick revision notes for Redox Reactions — Madhya Pradesh Board Class 11 Chemistry. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Classical Concept of Redox Reactions
- Originally, oxidation meant addition of oxygen to an element or compound
- Reduction meant removal of oxygen from a compound
- Scope was later broadened to include hydrogen transfer
Electron Transfer Theory
- Modern definition based on electron transfer
- Oxidation: Loss of electrons by any species
- Reduction: Gain of electrons by any species
Oxidation Numbers
- Oxidation number is the apparent charge on an atom in a compound
- Based on assumption of complete electron transfer to more electronegative atom
- Used for book-keeping electrons in covalent compounds
Rules for Assigning Oxidation Numbers
- Free elements have oxidation number = 0
- Monatomic ions: oxidation number = charge on ion
- Alkali metals = +1, Alkaline earth metals = +2 in compounds
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