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JAMB Chemistry 1991 Question 30

Question 30

Chemical Equilibrium

Which of the following equilibria is unaffected by a pressure change?

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

Answer: B (H2(g) + I2(g) ⇌ 2HI(g))

Explanation

In H2 + I2 ⇌ 2HI there are 2 moles of gas on each side, so changing the pressure does not shift the equilibrium.