O-LevelChemistryRates of Reaction5070/11 · May/June 2011 · Q241 Mark

The diagram represents the manufacture of sulfuric acid by the Contact process. What is used in step R?

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Aconcentrated sulfuric acid followed by water

Bvanadium(V) oxide

Cwater followed by concentrated sulfuric acid

Dwater only

✓ Correct answer

A: concentrated sulfuric acid followed by water

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2011 Paper 1 Variant 1, question 24.

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