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JAMB Chemistry 2013 Question 27

Question 27

Chemical Equilibrium

2SO2(g) + O2(g) ⇌ 2SO3(g) ΔH = −395.7kJmol−1
In the reaction above, the concentration of SO3(g) can be increased by

  1. A.decreasing the pressure.
  2. B.decreasing the temperature.
  3. C.increasing the temperature.
  4. D.the addition of catalyst.
Show the answer and explanation

Answer: B (decreasing the temperature.)

Explanation

The forward reaction is exothermic, so lowering the temperature shifts the equilibrium to the right, giving more SO3.