O-LevelChemistryAtomic Structure5070/12 · May/June 2020 · Q61 Mark

Hydrogen sulfide, H2S, and hydrogen chloride, HCl, are both gases at temperatures above -50 °C. Which gas will diffuse most rapidly at the temperature given?

Ahydrogen chloride at -40 °C

Bhydrogen chloride at -20 °C

Chydrogen sulfide at -40 °C

Dhydrogen sulfide at -20 °C

✓ Correct answer

D: hydrogen sulfide at -20 °C

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Topic: Atomic Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2020 Paper 1 Variant 2, question 6.

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