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Unilorin Post-UTME Chemistry 2022 (Model questions) Question 1

Question 1

Environmental Pollution

Pollution of water by crude oil can lead to

  1. A.a decrease in carbon(IV)oxide content
  2. B.an increase in oxygen content
  3. C.a decrease in oxygen content
  4. D.an increase in growth of aquatic organisms
Show the answer and explanation

Answer: C (a decrease in oxygen content)

Explanation

An oil film on the surface stops oxygen from dissolving into the water, so the dissolved oxygen falls and aquatic life suffers.