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JAMB Chemistry 1995 Question 30

Question 30

Chemical Equilibrium

Which of the following equilibria is shifted to the right as a result of an increase in pressure?

  1. A.H2(g) + I2(g) ⇌ 2HI(g)
  2. B.2NO2(g) ⇌ N2O4(g)
  3. C.PCl5(s) ⇌ PCl3(s) + Cl2(g)
  4. D.2O3(g) ⇌ 3O2(g)
Show the answer and explanation

Answer: B (2NO2(g) ⇌ N2O4(g))

Explanation

Higher pressure favours the side with fewer gas molecules. In B, 2 molecules of NO2 form 1 of N2O4, so the equilibrium shifts right.