Discussion :: UPSC Civil Service Exam Questions
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A river is the source of water for water supply to a town. Its water is very turbid and polluted. The correct sequence of steps for treating the river water would be :
A.
Presedimentation -> prechlorination -> coagulation -> sedimentation -> filtration -> post chlorination
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B.
coagulation -> sedimentation -> post-chlorination
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C.
coagulation -> filtration -> sedimentation -> post-chlorination
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D.
sedimentation -> post-chlorination
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