WAEC Chemistry 2013 Objective — Question 33
Question 33 of 50 from the West African Examinations Council (WAEC) Chemistry 2013 Objective paper, with the correct answer and a full explanation.
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Consider the reaction represented by the equation: N2O4(g) ⇌ 2NO2(g); ΔH = +x kJmol⁻¹. What happens when the temperature is reduced at equilibrium?
- A. Concentration of N2O4(g) decreases
- B. Concentration of N2O4(g) increasesCorrect
- C. Pressure exerted by the gases increases
- D. Pressure exerted by the gases remains constant
Explanation
Since the forward reaction is endothermic, it is favoured by increase in temperature. This means the decrease in temperature will favour backward reaction i.e production of more N2O4.
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