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JAMB Chemistry 1978 Question 33

Question 33

Chemical Equilibrium

Consider the following exothermic reaction. 2SO2(g) + O2(g) ⇌ 2SO3(g). If the temperature of the reaction is reduced from 800°C to 500°C, and no other change takes place, then

  1. A.the reaction rate increases
  2. B.concentration of SO3 decreases
  3. C.concentration of SO3 increases
  4. D.SO2 gas becomes unreactive
  5. E.O2 gas becomes unreactive.
Show the answer and explanation

Answer: C (concentration of SO3 increases)

Explanation

For an exothermic forward reaction, lowering the temperature shifts the equilibrium to the right (Le Chatelier), so more SO3 forms.