A laboratory technician checks four bottles, each containing a single substance, using gas chromatography. The reference retention time for propan-1-ol and the peak measured for each bottle are shown. All measurements are made under the same conditions.
| Substance or sample | Retention time in minutes |
|---|---|
| Propan-1-ol | 3.8 |
| Sample A | 2.6 |
| Sample B | 4.9 |
| Sample C | 3.8 |
| Sample D | 1.7 |
Which sample contains propan-1-ol?
Sample B
Sample D
Sample C
Sample A
107 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.