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JAMB Chemistry 2010 Question 28

Question 28

Rates of Reaction

In the preparation of oxygen by heating KClO3 in the presence of MnO2, only moderate heat is needed because the catalyst acts by

  1. A.lowering the pressure of the reaction
  2. B.increasing the surface area of the reactant
  3. C.increasing the rate of the reaction
  4. D.lowering the energy barrier of the reaction
Show the answer and explanation

Answer: D (lowering the energy barrier of the reaction)

Explanation

MnO2 provides a route with a lower activation energy (energy barrier), so less heat is needed.