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JAMB Chemistry 2009 Question 27

Question 27

Rates of Reaction

In the diagram above, which of the curves represents the evolution of oxygen with time in the equation 2KClO3(s) → 2KCl(s) + 3O2(g)?

Diagram for this question
  1. A.X
  2. B.Y
  3. C.Z
  4. D.R
Show the answer and explanation

Answer: D (R)

Explanation

The volume of oxygen starts at zero, rises quickly, then levels off when all the KClO3 has decomposed, which is curve R.