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JAMB Chemistry 1990 Question 28

Question 28

Rates of Reaction

Which of the following samples will react fastest with dilute trioxonitrate (V) acid?

  1. A.5 g of lumps of CaCO3 at 25°C
  2. B.5 g of powdered CaCO3 at 25°C
  3. C.5 g of lumps of CaCO3 at 50°C
  4. D.5g of powdered CaCO3 at 50°C.
Show the answer and explanation

Answer: D (5g of powdered CaCO3 at 50°C.)

Explanation

A powder has a larger surface area and a higher temperature gives faster particles, so powdered CaCO3 at 50°C reacts fastest.