JAMB Chemistry 2021 Objective — Question 17

Question 17 of 41 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2021 Objective paper, with the correct answer and a full explanation.

2SO₂(g) + O₂(g) → 2SO₃(g), ΔH = −ve. The yield of SO₃ can be improved by

A. Increasing the temperature
B. Increasing the pressureCorrect
C. Decreasing the pressure
D. Adding a catalyst

Explanation

Reaction has fewer moles of gas on right (2 vs 3). By Le Chatelier's principle, increasing pressure favours the side with fewer moles of gas (right), increasing SO₃ yield. Temperature increase would decrease yield (exothermic reaction).

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