A-LevelChemistryNitrogen and sulfur9701/12 · Feb/Mar 2023 · Q171 Mark

Two procedures are described. 1 Sulfur is burned in an excess of oxygen and then NO is added to the product mixture. 2 Sulfur is burned in an excess of oxygen and then NO2 is added to the product mixture. Which procedures will produce some sulfur trioxide, SO3?

Aboth 1 and 2

B1 only

C2 only

Dneither 1 nor 2

✓ Correct answer

A: both 1 and 2

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Topic: Nitrogen and sulfur, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2023 Paper 1 Variant 2, question 17.

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