Alum is mainly used for __________ in water treatment plants.

settling of suspended particles

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killing germs

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removing odour

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removing bad taste

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Solution

The correct option is A settling of suspended particles
Alum crystals help in settling of suspended impurities. Usually, alum is used in loading tank, where the suspended impurities settle down at the bottom.

Killing of bacteria happens in chlorination tanks in water treatment plants.

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