WAEC Chemistry 2010 Objective — Question 33
Question 33 of 49 from the West African Examinations Council (WAEC) Chemistry 2010 Objective paper, with the correct answer and a full explanation.
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Consider the equilibrium reaction represented by the following equation: 2SO2(g)+O2(g)⇌2SO3(g); ΔH=-395.7kJmol⁻¹. Which of the following statements about the equilibrium system is correct?
- A. A. Addition of catalyst changes the equilibrium position
- B. B. Decrease in pressure increases the yield of SO3
- C. C. Decrease in pressure increases the equilibrium concentration of O2Correct
- D. D. Increase in temperature favours the forward reaction
Explanation
Since the forward reaction is exothermic, an increase in temperature will favour the backward reaction. Since there are more moles of gases on the left hand side, a decrease in pressure will favour the backward reaction, leading to the production of more O2 (increasing its equilibrium concentration).
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