Redox Reactions Class 11 Notes - Chapter 8

According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 7.

A Redox reaction is the combination of both oxidation and reduction reactions. When a redox reaction takes place, both oxidation and reduction reactions also occur simultaneously.

What is a Redox Reaction?

Redox is a term used for the oxidation-reduction reaction. A redox reaction is a chemical reaction where a change in the oxidation state of atoms occurs. It involves electron transfer, i.e. if one chemical species gains electrons, then another chemical species gives or loses electrons. The species from which the electron is lost is said to be oxidized, whereas the species to which the electron is added is said to be reduced. For example, zinc displaces copper in an aqueous solution called copper sulfate.

Redox reactions can be classified into four different categories:

  • Combination reaction
  • Decomposition reaction
  • Displacement reaction
  • Disproportionation reaction

Read more: Redox reaction

Oxidizing And Reducing Agents

The role of an oxidizing agent (Oxidant) in a chemical reaction is to gain electrons. They are highly electronegative. Once they gain electrons, these substances are reduced. An oxidant is also known as an electron acceptor. For example, nitric acid and halogen.

The role of a reducing agent (Reductant) in a chemical reaction is to lose electrons. Once they lose electrons, these substances are oxidized. A reductant is also known as an electron donor. Examples include sulfite compounds and earth metals.

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Also Access 
NCERT Solutions for Class 11 Chemistry Chapter 8
NCERT Exemplar for Class 11 Chemistry Chapter 8

Few Important Questions

  1. Excess chlorine from drinking water is removed by treating it with sulphur dioxide. Write a balanced equation for this redox change.
  2. Why is AgF2 a very strong oxidizing agent? Explain.
  3. Why do ozone and nitric acid act only as oxidants? Explain.

To solve questions on Redox Reaction and Stoichiometry, watch the below video

Discover more about Redox Reactions Class 11 Notes from this article at BYJU’S website.

Other Important Links:

Frequently Asked Questions on CBSE Class 11 Chemistry Notes Chapter 8 Redox Reaction


What is a reducing agent?

A reducing agent typically is in one of its lower possible oxidation states and is known as the electron donor.


What is a combination reaction?

A combination reaction is a reaction in which two reactants combine to form one product.


What happens in a displacement reaction?

When a more reactive element displaces or pushes out, a less reactive element from a compound contains the less reactive element. This is the basic principle behind a Displacement reaction.


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