Two compounds each contain iron ions and anions represented by X. Each X ion has a charge of 2−.
| Compound | Colour |
|---|---|
| A | Pale green |
| B | Reddish brown |
Explain how the colour observations can be used to identify the iron ion in each compound, and deduce the formula of each compound.
91 exam-style questions on AQA GCSE Chemistry 1.3 Properties of transition metals, covering 1.3.1 Comparison with Group 1 elements and 1.3.2 Typical properties of transition metals. Each one has a worked solution and a mark scheme showing where the marks go.