O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2018 · Q181 Mark

Calcium carbonate reacts with dilute hydrochloric acid to produce carbon dioxide. The carbon dioxide is collected using the apparatus shown. The reaction is done four times. For each reaction, 25 g of calcium carbonate and an excess of hydrochloric acid are used. Which reaction mixture fills the gas syringe with carbon dioxide in the shortest time?

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Alumps of calcium carbonate with 1 mol/dm³ hydrochloric acid

Blumps of calcium carbonate with 2 mol/dm³ hydrochloric acid

Cpowdered calcium carbonate with 1 mol/dm³ hydrochloric acid

Dpowdered calcium carbonate with 2 mol/dm³ hydrochloric acid

✓ Correct answer

D: powdered calcium carbonate with 2 mol/dm³ hydrochloric acid

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2018 Paper 1 Variant 1, question 18.

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