A chemist analyses a sample using flame emission spectroscopy. The table shows the results and a set of reference data.
| Substance | Wavelengths of lines (nm) |
|---|---|
| Lithium ions | 610, 671 |
| Sodium ions | 589 |
| Calcium ions | 423, 616, 644 |
| Sample | 589, 616, 671 |
Which conclusion is correct?
The sample contains lithium ions, sodium ions and calcium ions.
The sample contains sodium ions and at least one metal ion that is not in the table.
The sample contains sodium ions and calcium ions only.
The sample contains sodium ions and lithium ions only.
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.