JAMB Chemistry 2016 Objective — Question 22

Question 22 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2016 Objective paper, with the correct answer and a full explanation.

N2O4(g) ⇌ 2NO2(g), ΔH = +ve. In the reaction above, an increase in temperature will

A. increase the reactant production
B. increase the value of the equilibrium constantCorrect
C. shift the equilibrium to the left
D. decrease the value of the equilibrium constant

Explanation

Since the forward reaction is endothermic, the backward reaction will be exothermic. Thus, a decrease in temperature favours the backward reaction (equilibrium position shifts to the left); an increase in temperature favours the forward reaction and increases the equilibrium constant.

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