Three water samples namely river water untreated sewage water and secondary effluent discharged from a sewage treatmen

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Q 1923445341.     Three water samples namely river water
untreated sewage water and secondary effluent
discharged from a sewage treatment plant were
subjected to BOD test. The samples were
labc!k' did not note which was which. The BOD values
of the three samples A, Band C were recorded
as 20mg/L, 8mg/Land 400mg/L, respectively.
Which sample of the water is most polluted?
Can you assign the correct label to each
assuming the river water is relatively clean

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(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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