explain how alum helps to separate suspended impurities from a mixture of sand and water?
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Answer: alum is a substance which helps to clean the water. if we keep alum in impure water and kept the container untouched the impure particles become dense and settle down in the bottom of the container. and in this way we are able to purify the water
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Every organism that is alive needs water to survive. In fact, without water, life on Earth would never have started. Water is also one of the reasons that
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