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Complete Lesson Plan of COLLOIDAL SOLUTION

Complete Lesson Plan of COLLOIDAL SOLUTION 

This article contains complete lesson plan of Colloidal Solution of Class IX NCERT following CBSE board.

Pdf of this article is also available in complete tabular form


  1. To develop interest of students in physical science.
  2. To develop an inquiry spirit in the students.
  3. To help students to see the physical science in relation to the rest of the culture.
  4. To develop interest in questioning.
  5. To develop critical thinking and scientific attitude.
  6. To develop supervisory ability in students.
  7. To develop problem solving skills in students.
  8. To make the students aware about inventions in the field of physical science and acquaint them with the knowledge of different streams of physical science.


  1. Students will be able to recall solution.
  2. Students will be able to explain tyndall effect.
  3. Students will be able to prepare a colloidal solution.


Chart, Roller board, pointer and other useful classroom equipments.


Students are already aware about solution.


Pupil-Teacher Activity

Student’s Response

Q1. What is a solution?

It is a homogeneous mixture

Q2. Give few examples of solution.

soda water, lemonade,etc.

Q3. What type of solution is a milk?

Colloidal solution


So, today we are going to study the topic ‘Colloidal Solution’.


Teaching point 1: Definition & Components of Colloidal Solution

Colloidal solution is a heterogeneous mixture in which particles remain suspended in the solution uniformly.

Components of colloidal solution are:

  1. Dispersed phase: Solute like components or dispersed particles form the dispersed phase.
  2. Dispersion medium: The components in which dispersed phase is suspended is called the dispersing medium.

Examples of Colloids: Fog, clouds, mist, smoke, milk, butter, blood, etc.

Teaching point 2: Tyndall Effect
  • Particles of colloidal solution are so small that it cannot be seen with naked eyes.
  • These particles scatter a beam of visible light passing through it.
  • This scattering of a beam of light is called Tyndall effect.

Some examples of Tyndall effect:

  • A fine beam of light entering room through small hole.
  • Sunlight passing through canopy of a dense forest.
Teaching point 3: Properties of a colloid
  • A colloid is a heterogeneous mixture.
  • The size of particles of a colloid is too small to be seen individually by naked eyes.
  • Colloids are big enough to scatter a beam of light passing through it and make its path visible.
  • They do not settle down when left undisturbed which means a colloid is quite stable.
  • They cannot be separated by the process of filtration.
  • But they can be separated by a special technique called centrifugation.


  • Colloidal solution is a heterogeneous mixture.
  • Particles of colloidal solution are not visible to naked eyes.
  • Colloids have two phase or components: dispersed phase and dispersion medium.
  • Colloidal solution shows tyndall effect.
  • Colloidal cannot be separated by filtration.
  • Particles of colloids can be separated by centrifugation.


Pupil-teacher will supervise the students work and solve the problems of the students.


Q1.  Colloidal solution is a:

  1. Homogeneous mixture
  2. Heterogeneous mixture

Q2. Colloid shows _________ effect.

Q3. Colloidal solution can be separated by filtration method. (True/False)

Q4. Colloidal solutions are separated by __________ technique.

Q5. What are the two components of colloids?


Q1. What is tyndall effect? Give few examples of tyndall effect phenomenon.

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