In water purification, after sedimentation water undergoes:

chlorination

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filtration

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ozonisation

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aeration

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Solution

The correct option is B filtration
The setting of suspended solid matter at the bottom of a liquid is called sedimentation. The water after sedimentation still contains some light suspended impurities which are removed by filtration through beds of sand and gravel. Filtration is followed by chlorination, ozonisation and aeration.

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