6.Chemicals like alum is added to water to coagulate the floating matter so that impurities become heavier and settle down. This process is known as. Multiple choice.
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sedimentation
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chlorination
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sedimentation is the name of this process in which alum is added to impure water to settle down the heavier impurities at the bottom of the tank
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I can't understand the question so i can't answer! sorry
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