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JAMB Chemistry 2011 Question 21

Question 21

Environmental Pollution

An effect of thermal pollution on water bodies is that the

  1. A.volume of water reduces
  2. B.volume of chemical waste increases
  3. C.level of oxides of nitrogen increases
  4. D.level of oxygen reduces
Show the answer and explanation

Answer: D (level of oxygen reduces)

Explanation

Gases are less soluble in warm water, so heating a river or lake lowers its dissolved oxygen.