O-LevelChemistryRates of Reaction5070/11 · May/June 2018 · Q191 Mark
A student wrote two conclusions about calcium carbonate. conclusion 1 The reaction with dilute hydrochloric acid is faster with powdered calcium carbonate than with large pieces of calcium carbonate. conclusion 2 Grinding large pieces of calcium carbonate to form powder increases the surface area. Which statement is correct?
ABoth conclusions are correct and conclusion 2 explains conclusion 1.
BBoth conclusions are correct but conclusion 2 does not explain conclusion 1.
CConclusion 1 is correct but conclusion 2 is not correct.
DConclusion 2 is correct but conclusion 1 is not correct.
✓ Correct answer
A: Both conclusions are correct and conclusion 2 explains conclusion 1.
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