O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2016 · Q91 Mark

Four gases are listed. 1 CH₄ 2 NH₃ 3 CO₂ 4 N₂ 1 mol/dm³ of each of gases 1 – 4 is allowed to diffuse. What is the order of their rate of diffusion at room temperature and pressure?

Aslowest: 1, 2, 4, fastest: 3

Bslowest: 2, 1, 3, fastest: 4

Cslowest: 3, 4, 2, fastest: 1

Dslowest: 4, 1, 3, fastest: 2

✓ Correct answer

C: slowest: 3, 4, 2, fastest: 1

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2016 Paper 1 Variant 1, question 9.

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