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Unilorin Post-UTME Chemistry 2022 (Model questions) Question 13

Question 13

Chemical Equilibrium

PCl5(l) ⇌ PCl3(l) + Cl2(g) ΔH = +ve
In the reaction above, the forward reaction is favoured by

  1. A.increasing the size of the containing vessel
  2. B.increasing the pressure
  3. C.adding a catalyst
  4. D.increasing the temperature
Show the answer and explanation

Answer: D (increasing the temperature)

Explanation

The forward reaction is endothermic (ΔH positive), so raising the temperature shifts the equilibrium to the right. A catalyst does not shift equilibrium.