A student tests a gas, X. The table shows the results.
| Test | Result |
|---|---|
| Hold a glowing splint in the gas | Splint does not relight |
| Hold a lit splint at the mouth of the tube | Splint goes out with no pop |
| Bubble the gas through limewater | Limewater stays colourless |
| Hold damp blue litmus paper in the gas | Litmus paper stays blue |
Which gas could be X?
Carbon dioxide
Chlorine
Hydrogen
Nitrogen
52 exam-style questions on OCR GCSE Chemistry 4.2 Identifying the products of chemical reactions, covering 4.2.1 Tests to identify gases, 4.2.2 Tests for aqueous ions and flame tests, and 4.2.3 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.