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UPSC Civil Service Exam Questions

Q1:

In the plot of residual chlorine versus chlorine dose applied shown in the above figure, the curve will not have any (0, 0) point because

A of experimental error

B chlorine escapes into the atmosphere

C chlorine requires some contact time

D chlorine is consumed for disinfection

ANS:C - chlorine requires some contact time

Because cl2 gets consumed to oxidise fe2+ n mn2+ into fe2o3 n mno2 in early region.



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