A-LevelChemistryGroup 179701/12 · May/June 2018 · Q171 Mark

When concentrated sulfuric acid is added to solid sodium bromide, bromine gas is produced, along with a number of other products. However when concentrated sulfuric acid is added to solid sodium chloride only hydrogen chloride and sodium hydrogensulfate are produced. What is the reason for this difference?

ABromine is less volatile than chlorine.

BHydrochloric acid is a weak acid.

CSulfuric acid is not an oxidising agent.

DThe bromide ion is a stronger reducing agent than the chloride ion.

✓ Correct answer

D: The bromide ion is a stronger reducing agent than the chloride ion.

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Topic: Group 17, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2018 Paper 1 Variant 2, question 17.

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