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JAMB Chemistry 2010 Question 30

Question 30

Chemical Equilibrium

2H2(g) + O2(g) ⇌ 2H2O(g) ΔH = −ve
What happens to the equilibrium constant of the reaction above if the temperature is increased?

  1. A.It is unaffected.
  2. B.It becomes zero.
  3. C.It decreases.
  4. D.It increases.
Show the answer and explanation

Answer: C (It decreases.)

Explanation

For an exothermic reaction, raising the temperature favours the backward reaction, so K decreases.