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JAMB Chemistry 1990 Question 7

Question 7

Gas Laws

Equal volumes of CO, SO2, NO2 and H2S were released into a room at the same point and time. Which of the following gives the order of diffusion of the gases to the opposite corner of the room? [S = 32, C = 12, O = 16, N = 14, H = 1].

  1. A.CO, SO2, NO2, H2S
  2. B.SO2, NO2, H2S, CO
  3. C.CO, H2S, SO2, NO2
  4. D.CO, H2S, NO2, SO2
Show the answer and explanation

Answer: D (CO, H2S, NO2, SO2)

Explanation

By Graham's law lighter gases diffuse faster. The molar masses are CO 28, H2S 34, NO2 46 and SO2 64, so they arrive in that order.