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Reported Question / Answer
Q.) The minimum recommended dose of free residual chlorine in water for routine chlorination (expressed in mg/L) is -
1)
1.0 mg after 1 hour contact
2)
1.0 mg after half hour contact
3)
0.5 mg after 1 hour contact
4)
0.5 mg after half hour contact
5)
NULL
Answer :
3
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