WAEC Chemistry 2023 Objective — Question 28

Question 28 of 50 from the West African Examinations Council (WAEC) Chemistry 2023 Objective paper, with the correct answer and a full explanation.

Which of the following gases has the lowest rate of diffusion? [H=1.0, C=12.0, N=14.0, O=16.0]

A. Nitrogen
B. Ammonia
C. OxygenCorrect
D. Methane

Explanation

N2 = 14×2 = 28; NH3 = 14+(1×3) = 17; O2 = 16×2 = 32; CH4 = 12+(1×4) = 16. The heavier a gas, the lower its rate of diffusion. Oxygen is the heaviest here, so it has the lowest diffusion rate.

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