O-LevelChemistryAcids, Bases & Salts5070/12 · May/June 2018 · Q41 Mark

Two gases, ammonia and hydrogen chloride, at an equal pressure, are allowed to enter the apparatus shown. After a time, a white solid forms on the inside of the tube. Which statements explain why a white solid forms in the position shown? 1 Ammonia and hydrogen chloride react to form solid ammonium chloride. 2 Ammonia diffuses faster than hydrogen chloride. 3 Ammonia has a lower relative molecular mass than hydrogen chloride.

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A1, 2 and 3

B1 and 2 only

C1 only

D2 and 3 only

✓ Correct answer

A: 1, 2 and 3

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2018 Paper 1 Variant 2, question 4.

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