In four different experiments, 1, 2, 3 and 4, nitric acid was added to excess marble chips and the amount of carbon dioxide produced was measured by volume. The same volume of nitric acid was used in every experiment. Either its concentration, or its temperature, or both its concentration and temperature, were altered. The outcomes of the experiments are shown on the graph. Which statement is correct?
- AA lower 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.