NCERT Question 4 - Chapter 2 Class 9 - Is Matter Around Us Pure

Last updated at Dec. 16, 2024 by

Explain the following giving examples.

  1. saturated solution
  2. pure substance
  3. colloid
  4. suspension

Answer

(a) Saturated Solution - A solution in which no more solute can be dissolved without raising temperature is called saturated solution.

For example, 36g of salt in 100g of water.

 

(b) Pure substance - The substances that are made up of only one type of particles are called pure substances. For example-Salt, Oxygen, Water.

 

(c) Colloid - A colloid is a heterogeneous mixture in which the size of solute particles lies between the size of particles of a solution and suspension and which shows tyndall effect. For example- Milk, Blood

 

(d) Suspension - It is a heterogeneous mixture of small particles of solid in liquid. These particles do not dissolve in the liquid and are visible by the naked eye.

 

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