alum is used to purify water as its coagulated (settle down) the impurities present the water.
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Aluminium Sulfate, Shortly known as Alum, when added to raw water reacts with the bicarbonate alkalinities present in water and forms a gelatinous precipitate. This floc attracts other fine particles and suspended material in raw water, and settles down at the bottom of the container.
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this is a type of fraction exist between two bodies that can elevate at a rest event for an external force is acting on
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