A ferry operator receives two deliveries of the same type of fuel. Quality-control tests give the following results.
| Delivery | Sulfur impurity (% by mass) |
|---|---|
| R | 0.03 |
| S | 0.30 |
A test engine burns a 5.0 kg sample from each delivery under the same operating conditions.
Which statement explains the difference expected between the two deliveries?
Delivery R releases more sulfur dioxide because its lower sulfur content makes combustion more complete.
Both deliveries release the same sulfur dioxide because the engine operates at the same temperature.
Neither delivery releases sulfur dioxide because sulfur impurities leave the engine as solid soot.
Delivery S releases more sulfur dioxide because it supplies more sulfur to react with oxygen.
102 exam-style questions on AQA GCSE Chemistry 9.3 Common atmospheric pollutants and their sources, covering 9.3.1 Atmospheric pollutants from fuels and 9.3.2 Properties and effects of atmospheric pollutants. Each one has a worked solution and a mark scheme showing where the marks go.