O-LevelChemistryRates of Reaction5070/11 · May/June 2024 · Q171 Mark

A 2 g sample of calcium carbonate reacts with dilute hydrochloric acid as shown. CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + H₂O(l) Which change in conditions makes the reaction proceed more slowly?

Aincreasing the acid concentration

Bincreasing the size of the solid particles

Cincreasing the surface area of the solid particles

Dincreasing the temperature

✓ Correct answer

B: increasing the size of the solid particles

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2024 Paper 1 Variant 1, question 17.

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