A solution contains two dissolved compounds. A student does four tests on the solution.
| Test | Result |
|---|---|
| Flame test | Yellow-orange flame |
| Add sodium hydroxide solution | Green precipitate |
| Add dilute nitric acid, then silver nitrate solution | White precipitate |
| Add dilute hydrochloric acid, then barium chloride solution | White precipitate |
Which two compounds could be in the solution?
Sodium sulfate and iron(III) chloride
Sodium chloride and copper(II) sulfate
Sodium chloride and iron(II) sulfate
Potassium chloride and iron(II) sulfate
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.