NCERT Solutions For Class 11 Chemistry Redox Reaction

Class 11 Chemistry Chapter 8 NCERT Solutions

NCERT Solutions Class 11 Chemistry Chapter 8 PDF

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A redox reaction is a chemical reaction that includes a transfer of electrons. It is also called as the oxidation-reduction reaction. In reduction reactions, there is a gain of electrons and in oxidation reactions, there is a loss of electrons. For example:

CuSO4 (aq) + Zn(s) → ZnSO4 (aq) + Cu(s)

This is a redox reaction. In this aqueous solution of copper sulfate: Zinc (Zn) gains sulfate and copper (Cu) losses sulfate.

There are many examples of Redox Reactions related to our day to day activities. Listed below are a few of them:

  • Combustion
  • Respiration
  • Rusting of metals.
  • Photosynthesis in Plants.
  • Using washing powder to remove the dirt from clothes.
  • Raw materials used in cooking getting converted into edible forms.

The name Redox contains two parts: “Reduction and oxidation”. Will now learn what are these two reactions and also about redox reaction.

Oxidation and reduction can be explained in different terms.

In terms of oxygen transfer

  • Oxidation reaction: The reaction in which there is an addition of oxygen to an element is called oxidation reaction.
  • Reduction reaction: The reaction in which there is a loss of oxygen from an element is called reduction reaction.
  • Redox Reaction: “The reaction in which both reduction and oxidation takes place at the simultaneously is called redox reaction.”

Given below is an example of redox reaction

In terms of hydrogen transfer

  • Oxidation reaction: The reaction in which there is an addition of hydrogen to an element is called oxidation reaction.
  • Reduction reaction: The reaction in which there is a loss of oxygen from an element is called reduction reaction.

The point to be noted here is these are exactly opposite of oxygen transfer definition.

Example: Here Ethanol is oxidised to Ethanal.

Example: Here Ethanal is reduced to Ethanol.

In terms of electron transfer

The electron transfer is the most common way of explaining the redox reaction concept.

  • Oxidation: The reaction in which there is loss of electrons is called oxidation reaction.

It can be easily memorised as

LEO= Loss of Electrons Oxidation

  • Reduction: The reaction in which there is gain of electrons is called reduction reaction.

It can be easily memorised as

GER= Gain of Electrons Reduction

Hence, GER and LEO are the vital parts of redox reaction.

Example: Will consider an ionic equation for better understanding

In the above reaction, Magnesium loses its two electrons and stabilises copper as copper gains two electrons from magnesium.

Applications:

Redox Reaction can be seen in daily life. Examples

  1. Rusting of iron or corrosion
  2. Spoilage of food articles

These can be avoided by painting or oiling the iron articles. By keeping the food in air tight containers or in a cold storage.

For more information on NCERT Solutions for Class 11 Chemistry, Chapter 8 Redox Reaction, check the solutions given below.

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