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JAMB Chemistry 1993 Question 29

Question 29

Rates of Reaction

In the diagram above, curve X represents the energy profile for a homogeneous gaseous reaction. Which of the following conditions would produce curve Y for the same reaction?

Diagram for this question
  1. A.Increase in temperature
  2. B.Increase in the concentration of a reactant
  3. C.Addition of a catalyst
  4. D.Increase in pressure
Show the answer and explanation

Answer: C (Addition of a catalyst)

Explanation

Curve Y has a lower energy hump between the same reactants and products, meaning a lower activation energy. Only a catalyst lowers the activation energy.