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Redox Reactions — Revision Notes

CBSE · Class 11 · Chemistry

Redox Reactions revision notes for CBSE Class 11 Chemistry: 4 topics in quick points. Part of the CBSE Class 11 Chemistry syllabus.

77 questions74 flashcards4 formulas & key relations5 concepts

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Key Topics to Revise

1

Core ideas and definitions

  • Oxidation and reduction always occur together in a redox reaction.
  • Oxidation was first understood as addition of oxygen or removal of hydrogen; the meaning is now broader.
  • Reduction means removal of oxygen or electronegative element, or addition of hydrogen or electropositive element.
2

Oxidation number rules and special cases

  • In free elements, oxidation number is zero.
  • For a monoatomic ion, oxidation number equals its charge.
  • Oxygen is usually −2 in compounds.
3

Reaction types in redox chemistry

  • Redox reactions are classified as combination, decomposition, displacement, and disproportionation reactions.
  • In a combination redox reaction, elemental substances combine to form one product.
  • In a decomposition redox reaction, one compound breaks into simpler substances, at least one of which is elemental.
4

Key examples and comparative reactivity

  • Zinc displaces copper from copper sulphate solution.
  • Copper displaces silver from silver nitrate solution.
  • The order of reducing tendency among Zn, Cu, and Ag is Zn > Cu > Ag.

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Full Notes

Key Concepts

Oxidation means addition of oxygenOxidation is loss of electronsOxidation number is a bookkeeping numberRedox reactions are classified as combinationWhen a more reactive metal such

Frequently Asked Questions

What are the important topics in Redox Reactions for CBSE Class 11 Chemistry?
Key topics in Redox Reactions include Core ideas and definitions, Oxidation number rules and special cases, Reaction types in redox chemistry, Key examples and comparative reactivity. Study these first, then practise questions on each for Class 11 exams.
How should I revise Redox Reactions for Class 11 exams?
Learn the core ideas first, then work through the 77 practice questions on Redox Reactions. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All CBSE Class 11 Chemistry Revision Notes

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