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JAMB Chemistry 2002 Question 10

Question 10

Chemical Equilibrium

PCl5(g) ⇌ PCl3(g) + Cl2(g)
In the reaction above, a decrease in pressure will

  1. A.decelerate the reaction
  2. B.increase the yield of PCl3
  3. C.increase the yield of PCl5
  4. D.accelerate the reaction.
Show the answer and explanation

Answer: B (increase the yield of PCl3)

Explanation

The right side has more gas molecules (2) than the left (1). Lowering the pressure shifts the equilibrium towards more molecules, giving more PCl3.