JAMB Chemistry 2013 Objective — Question 27

Question 27 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

2SO2(g) + O2(g) ⇌ 2SO3(g) ΔH = -395.7kJmol⁻¹. In the reaction above, the concentration of SO3(g) can be increased by

A. increasing temperature
B. the addition of catalyst
C. decreasing the pressure
D. decreasing the temperatureCorrect

Explanation

Since the reaction is exothermic, the forward reaction (production of more SO3) is favoured by a decrease in temperature.

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