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JAMB Chemistry 1986 Question 20

Question 20

Chemical Equilibrium

What is the consequence of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) ⇌ Zn(s) + H2O(l)?

  1. A.The equilibrium is driven to the left
  2. B.The equilibrium is driven to the right
  3. C.There is no effect
  4. D.More ZnO(s) is produced.
Show the answer and explanation

Answer: B (The equilibrium is driven to the right)

Explanation

Increasing pressure favours the side with fewer gas molecules. There is one mole of gas (H2) on the left and none on the right, so the equilibrium moves to the right.