O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2019 · Q221 Mark

Sulfuric acid is manufactured using the contact process. The equations for the reactions in the process are shown. reaction 1 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) ΔH = –198 kJ/mol reaction 2 SO₃(g) + H₂O(l) → H₂SO₄(aq) Which statements are correct? 1 Reaction 1 is reversible. 2 Reaction 1 is exothermic. 3 In reaction 2, sulfur dioxide reacts with water to form sulfuric acid.

A1 and 2 only

B1 and 3 only

C2 and 3 only

D1, 2 and 3

✓ Correct answer

A: 1 and 2 only

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2019 Paper 1 Variant 1, question 22.

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