Theory:

In your childhood, you might have played in/with muds. But, have you ever gave a thought, what happens when we add mud to freshwater?
 
Will it dissolve or not?
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We know that the soil or mud are in a solid-state, whereas water is in liquid-state. And, when you mix these two substances, mud or soil do not dissolve in the water. Therefore, this kind of solution is known as suspension.
Suspension:
  • The heterogeneous mixture in which the solute particles do not dissolve in the solvent and settle down entirely in the medium.
  • We can filter the undissolved particles by the filtration method. These particles are visible to the naked eye.
Example:
1. Clay mixture with water
 
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2. Flour in water
 
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3. Mixture of chalk and water
 
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Properties of a suspension:
  
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1. Suspension is a heterogeneous mixture.
2. The solute particle settles down when it is left undisturbed because suspensions are unstable. 
3. Through your naked eye, you can see these suspended particles.
 
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4. Suspension particles scatter a beam of light passing through it and make its path visible.
Note:
  • When the suspended particles settle down, the beam of light is not scattered.
  • We use filtration process to separate the suspended particles.