The table shows the results of tests on a salt, Z.
| Test | Result |
|---|---|
| flame test | orange-red flame |
| sodium hydroxide solution added until in excess | white precipitate that does not dissolve |
| dilute hydrochloric acid, then barium chloride solution | no visible change |
| dilute nitric acid, then silver nitrate solution | yellow precipitate |
What is Z?
aluminium iodide
calcium iodide
calcium bromide
lithium iodide
35 exam-style questions on Edexcel GCSE Chemistry 10.1 Qualitative analysis: tests for ions, covering 10.1.1 Principles of ion tests and flame tests, 10.1.2 Tests for cations and for ammonia, 10.1.3 Tests for anions, 10.1.4 Identification of ions in unknown salts, and 10.1.5 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.