Redox Reactions Class 11 Notes - Chapter 8

Redox reaction is the combination of both oxidation and reduction reactions. When 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. 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. 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

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. Example nitric acid, halogen, etc.

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. Example sulfite compounds, earth metals, etc.


Few Important Questions

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

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