O-LevelChemistryAcids, Bases & Salts5070/11 · May/June 2018 · Q11 Mark

A gas is less dense than air and dissolves in water. Which diagram shows the correct method of collecting this gas?

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ACollection by downward displacement of air, into an upright gas jar.

BCollection by upward displacement of air, into an upright gas jar.

CCollection directly into a gas syringe.

DCollection over water, displacing water in an inverted measuring cylinder.

✓ Correct answer

B: Collection by upward displacement of air, into an upright gas jar.

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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 1, question 1.

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