A laboratory technician checks a gas entering a reaction vessel. The gas is known to be either carbon dioxide or chlorine.
The technician carries out two tests and concludes that the gas is carbon dioxide and not chlorine.
| Test | Result |
|---|---|
| Dry blue litmus paper was held in the gas | The paper remained blue |
| The gas was bubbled through fresh limewater | The limewater turned cloudy white |
Evaluate the technician's conclusion and methods.
89 exam-style questions on AQA GCSE Chemistry 8.2 Identification of common gases, covering 8.2.1 Test for hydrogen, 8.2.2 Test for oxygen, 8.2.3 Test for carbon dioxide, and 8.2.4 Test for chlorine. Each one has a worked solution and a mark scheme showing where the marks go.