Question

Impurities settled at the bottom when muddy water was kept overnight in a bucket .The clear water was then poured off from the top.The process of seperation used in this example is called ----------

Answer 1

The process of separation used in this example is called sedimentation and decantation.

Explanation:

• The density of the impurities are more than that of water. Denser objects settle in an immiscible solution. Hence due to gravity the particles settle by overnight settling. Now if an object like alum is added it speeds up the settling process. This is called sedimentation.  

• Once the particles have been settled the water above is clear. Now the water is poured into another clean and dry container without ‘disturbing the sediment’. This process is known as decantation.

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