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1.
Which one of the following impurities is easiest to remove from wastewater?
2.
Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of
3.
Which of the following causes biomagnifi
4.
Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unbumt hydrocarbons into
5.
Phosphate pollution in a waterbody is brought about by