O-LevelChemistryRates of Reaction5070/12 · Oct/Nov 2022 · Q231 Mark

In the Contact process, sulfur is converted into sulfuric acid. A catalyst is added to the reaction mixture shown in the equation. 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) What is the purpose of the catalyst?

Ato lower the activation energy for the reaction

Bto oxidise the sulfur dioxide

Cto reduce the sulfur dioxide

Dto shift the equilibrium to the right

✓ Correct answer

A: to lower the activation energy for the reaction

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2022 Paper 1 Variant 2, question 23.

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