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O-LevelChemistryStoichiometry5070/11 · Oct/Nov 2014 · Q81 Mark

Why does ammonia gas diffuse faster than hydrogen chloride gas?

AAmmonia has a higher boiling point than hydrogen chloride.
BAmmonia is a base, hydrogen chloride is an acid.
CThe ammonia molecule contains more atoms than a hydrogen chloride molecule.
DThe relative molecular mass of ammonia is smaller than that of hydrogen chloride.

✓ Correct answer

D: The relative molecular mass of ammonia is smaller than that of hydrogen chloride.

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About this question

Topic
Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source
O-Level Chemistry, Oct/Nov 2014 Paper 1 Variant 1, question 8.

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