JAMB Chemistry 2017 Objective — Question 35

Question 35 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2017 Objective paper, with the correct answer and a full explanation.

In which of the following reactions will an increase in pressure shift the equilibrium position to the left?

A. A. H2(g) + I2(g) ⇌ 2HI(g)
B. B. 2SO2(g) + O2(g) ⇌ 2SO3(g)
C. C. N2O4(g) ⇌ 2NO2(g)Correct
D. D. 3H2(g) + N2(g) ⇌ 2NH3(g)

Explanation

For N2O4⇌2NO2, the backward (leftward) reaction reduces the number of gas moles/volume, so an increase in pressure favours the backward reaction, shifting equilibrium to the left.

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