A) \[Cd,\,\,Pb\]and \[Hg\] present in industrial waste
B) heavy metals present in mining waste
C) detergents and fertilizers containing phosphate anion
D) polychlorinated biphenyls
Correct Answer: C
Solution :
Detergents and fertilizers contain phosphates as additives. The addition of phosphorus to water, in the form of the phosphate anion\[(PO_{4}^{3-})\], encourages the formation of algae, which reduces the dissolved oxygen concentration of water. This process is known as eutrophication.
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