WAEC Chemistry 2013 Objective — Question 25

Question 25 of 50 from the West African Examinations Council (WAEC) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

Which of the following gases are arranged in increasing order of diffusion rate? [H = 1.0; C = 12; N = 14; O = 16; S = 32]

A. SO2, O2, NH3, H2Correct
B. H2S, NH3, C2, SO2
C. CO2, N2O, O2, SO2
D. NH3, NO2, N2, CO2

Explanation

The denser a gas is, the slower its rate of diffusion — the diffusion rate is a function of the relative molecular mass. Relative molecular masses: SO2=64, O2=32, NH3=17, H2=2. Thus, the increasing order of diffusion rate will be SO2, O2, NH3, H2.

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