. . . . . . . . is a by product of sewage treatment and can be decomposed to produce biogas.
A. Sewage
B. Sludge
C. Sewer
D. Scum
Answer: Option B
This Question Belongs to Chemistry GK Chapter Wise >> Environmental Chemistry
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The term 'brown air' is used for
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B. Photochemical smog
C. Sulphurous smog
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