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JAMB Chemistry 2012 Question 29

Question 29

Rates of Reaction

The highest rate of production of carbon(IV) oxide can be achieved using

  1. A.0.05 mol dm−3 HCl and 5g powdered CaCO3
  2. B.0.05 mol dm−3 HCl and 5g lump CaCO3
  3. C.0.10 mol dm−3 HCl and 5g powdered CaCO3
  4. D.0.025 mol dm−3 HCl and 5g powdered CaCO3
Show the answer and explanation

Answer: C (0.10 mol dm−3 HCl and 5g powdered CaCO3)

Explanation

The fastest rate needs the highest acid concentration and the largest surface area (powder).