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Sedimentation

The dust part...

Question

The dust particles in the water can be helped to settle down faster by using:

A

Alcohol

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B

Alum

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C

Sugar

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D

Chlorine

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Solution

The correct option is B Alum
Water from a river or pond contains very fine clay particles as impurities. To settle these impurities at a faster rate, a chemical substance called alum is used. Alum dissolves in water and forms clusters with clay and dust particles making them heavier and therefore increasing the rate of sedimentation.

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