WAEC Chemistry 2022 Objective — Question 25
Question 25 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.
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Consider the following reaction equation: N2(g) + 3H2(g) ⇌ 2NH3(g); ΔH = −92kJ Increasing the temperature of the reaction would
- A. shift the equilibrium to the right
- B. increase the yield of ammonia
- C. decrease the amount of hydrogen
- D. decrease the yield of ammoniaCorrect
Explanation
Since the forward reaction is exothermic (ΔH is negative), increasing temperature favours the backward (endothermic) reaction, decreasing the yield of ammonia.
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