WAEC Chemistry 2012 Objective — Question 30

Question 30 of 50 from the West African Examinations Council (WAEC) Chemistry 2012 Objective paper, with the correct answer and a full explanation.

2HCl(aq) + CaCO3(s) → CaCl2 + CO2(g) + H2O(l). From the reaction above, which of the curves represents the production of CO2 gas as dilute HCl is added to the apparatus shown (with an empty flask, sodium, and water)?

A. L
B. MCorrect
C. N
D. P

Explanation

Curve M represents the production of CO2 gas over time as dilute HCl is gradually added to the calcium carbonate, based on the shape of gas evolution shown in the source diagram.

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