O-LevelChemistryRates of Reaction5070/12 · May/June 2017 · Q161 Mark
In four separate experiments, 1, 2, 3 and 4, nitric acid was added to excess marble chips and the volume of carbon dioxide formed was measured. In all four experiments the same volume of nitric acid was used. Its concentration, or temperature, or both concentration and temperature, were changed. The results of the experiments are shown on the graph. Which statement is correct?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Alower concentration of acid was used in experiment 3 than in experiment 1.
BExperiment 4 was faster than experiment 3.
CThe acid used in experiment 2 was of a lower concentration than in experiment 1.
DThe temperature of the acid was the same in experiments 1 and 2.
✓ Correct answer
A: lower concentration of acid was used in experiment 3 than in experiment 1.
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