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JAMB Chemistry 1985 Question 20

Question 20

Environmental Pollution

If the ONLY pollutants found in the atmosphere over a city are oxides of nitrogen, suspended lead compounds. carbon monoxide and high levels of methane, the probable source(s) of the pollution must be

  1. A.automobile exhaust and biological decomposition
  2. B.combustion of coal and automobile exhaust
  3. C.biological decomposition only
  4. D.combustion of coal, automobile exhaust and biological decomposition
  5. E.combustion of coal and biological decomposition
Show the answer and explanation

Answer: A (automobile exhaust and biological decomposition)

Explanation

Car exhaust gives oxides of nitrogen, lead compounds (from leaded petrol) and carbon monoxide; methane comes from rotting (biological decomposition). Coal burning would also give SO2, which is absent.