O-LevelChemistryMetals & Reactivity5070/12 · Oct/Nov 2022 · Q21 Mark

When iron reacts with dilute hydrochloric acid, hydrogen is formed. Impurities in the iron mean that some hydrogen sulfide gas is also formed. Hydrogen sulfide gas is soluble in water. Water vapour can be removed from a mixture of gases using concentrated sulfuric acid. Which diagram shows apparatus suitable to prepare a pure, dry sample of hydrogen?

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ADiagram A

BDiagram B

CDiagram C

DDiagram D

✓ Correct answer

C: Diagram C

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2022 Paper 1 Variant 2, question 2.

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