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JAMB Chemistry 1979 Question 22

Question 22

Air

When a piece of charcoal enclosed in a cylinder containing air is ignited

  1. A.the total volume of air is increased
  2. B.the relative amount of oxygen present is increased
  3. C.the relative amount of nitrogen present is decreased
  4. D.the relative amount of carbondioxide present is increased
  5. E.the ratio of oxygen to nitrogen in the system is increased.
Show the answer and explanation

Answer: D (the relative amount of carbondioxide present is increased)

Explanation

C + O2 → CO2: oxygen is used up and replaced by the same volume of carbon dioxide, so the proportion of CO2 goes up.