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JAMB Chemistry 1983 Question 48

Question 48

Rates of Reaction

Zn + 2HCl → ZnCl2 + H2
The rate of the above reaction will be greatly increased if

  1. A.the zinc is in the powdered form
  2. B.a greater volume of the acid is used
  3. C.a smaller volume of the acid is used
  4. D.the reaction vessel is immersed in an ice-bath
  5. E.the zinc is in the form of pellets.
Show the answer and explanation

Answer: A (the zinc is in the powdered form)

Explanation

Powdered zinc has a much larger surface area in contact with the acid, so the reaction is much faster.