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JAMB Chemistry 2003 Question 26

Question 26

Chemical Equilibrium

When at equilibrium, which of the reactions below will shift to the right if the pressure is increased and the temperature is kept constant?

  1. A.2SO3(g) ⇌ 2SO2(g) + O2(g)
  2. B.2CO2(g) ⇌ 2CO(g) + O2(g)
  3. C.2H2(g) + O2(g) ⇌ 2H2O(g)
  4. D.2NO(g) ⇌ N2(g) + O2(g)
Show the answer and explanation

Answer: C (2H2(g) + O2(g) ⇌ 2H2O(g))

Explanation

Higher pressure favours the side with fewer gas molecules. In C, 3 molecules on the left give 2 on the right, so it shifts right.