A gas supplier fills three small calibration cylinders, A, B and C. Each cylinder contains one of these gases:
Each gas is used once. The cylinder labels become detached.
A technician tests separate small samples from cylinders A and B.
| Cylinder | Test and result |
|---|---|
| A | A burning splint produces a squeaky pop |
| B | A glowing splint relights |
The technician decides that A contains hydrogen, B contains oxygen and C contains chlorine.
Evaluate the technician's decision. Include the test and expected result that would confirm the identity of the gas in cylinder C.
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.