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Reported Question / Answer
Q.) Oil and grease present in an emulsified state in waste water discharged from industries can be removed by
1)
skimming off.
2)
biological oxidation.
3)
chlorination.
4)
settling out using chemical reagents
5)
NULL
Answer :
4
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Message / Correct Answer / Suggestion
Human Verification : Answer 2 + 3 = ?
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