A-LevelChemistryElectrochemistry9701/12 · Feb/Mar 2021 · Q171 Mark

When concentrated sulfuric acid reacts with sodium iodide the products include sulfur, iodine, hydrogen sulfide and sulfur dioxide. Which statement is correct?

AHydrogen sulfide is the product of a reduction reaction.

BIodide ions are stronger oxidising agents than sulfate ions.

CSulfur atoms from the sulfuric acid are both oxidised and reduced.

DSulfur atoms from the sulfuric acid are oxidised to make sulfur dioxide.

✓ Correct answer

A: Hydrogen sulfide is the product of a reduction reaction.

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Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2021 Paper 1 Variant 2, question 17.

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