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JAMB Chemistry 1985 Question 24

Question 24

Chemical Equilibrium

In the reaction H2O(g) ⇌ H2(g) + ½O2(g) ΔH = −243600 kJ, which of the following has no effect on the equilibrium position?

  1. A.Adding argon to the system
  2. B.Lowering the temperature
  3. C.Adding hydrogen to the system
  4. D.Decreasing the pressure
  5. E.Increasing the temperature
Show the answer and explanation

Answer: A (Adding argon to the system)

Explanation

Argon does not take part in the reaction and, added at constant volume, does not change the partial pressures of the reacting gases. Changing temperature, pressure or the amount of hydrogen all shift the equilibrium.