A) \[SO_{4}^{2-}\]ion present in water
B) NaCI present in water
C) \[PO_{4}^{3-}\] present in water
D) heavy metal present in water
Correct Answer: C
Solution :
Eutrophication is due to the presence of \[PO_{4}^{3-}\] ion in water. Phosphates (plant nutrients) encourage the formation of algae and reduces DO concentration of water.
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