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JAMB Chemistry 1994 Question 32

Question 32

Rates of Reaction

2HCl(aq) + CaCO3(s) → CaCl2(aq) + H2O(l) + CO2(g). From the reaction above, which of the following curves represents the consumption of calcium trioxocarbonate (IV) as dilute HCl is added to it?

Diagram for this question
  1. A.L
  2. B.M
  3. C.N
  4. D.P
Show the answer and explanation

Answer: D (P)

Explanation

As acid is added, the amount of CaCO3 left falls, quickly at first and then more slowly. Curve P is the only one that falls with time.