Which of the following equilibrium does not get affected with the change in volume of the system?
Correct answer: D. N2(g) + O2(g) ⇋ 2NO(g)
- A. N2O4(g) ⇋ 2NO2(g)
- B. N2(g) + 3H2(g) ⇋ 2NH3(g)
- C. PCl5(g) ⇋ PCl3(g) + Cl2(g)
- D. N2(g) + O2(g) ⇋ 2NO(g)
Explanation
The correct option is Option D because the change in volume does not affect the equilibrium when Δn = 0, meaning the number of moles of gases on the reactant side equals the number of moles on the product side. In Option D, both sides have 2 moles of gases, so volume changes will not shift the equilibrium. In contrast, Options A, B, and C have different numbers of moles on each side, meaning their equilibria will shift with volume changes.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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