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JAMB Chemistry 2014 Question 30

Question 30

Chemical Equilibrium

Cr2O72−(aq) + H2O(l) ⇌ 2CrO42−(aq) + 2H+(aq)
What happens to the reaction above when the hydrogen ion concentration is increased?

  1. A.More of the products will be formed.
  2. B.The reaction will not proceed.
  3. C.The equilibrium position will shift to the right.
  4. D.The equilibrium position will shift to the left.
Show the answer and explanation

Answer: D (The equilibrium position will shift to the left.)

Explanation

H+ is a product; adding more of it makes the equilibrium shift to the left to use it up (Le Chatelier's principle).