a matching puzzle by
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https://www.puzzlefast.com/en/puzzles/20150501536339
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v2.18.0
| 1. | black | A. | copper (II) sulphate may be present |
| 2. | green | B. | chloride, sulphate, nitrate and carbonate of cations of sodium, potassium, barium, lead, magnesium , calcium, zinc and aluminium may be present |
| 3. | white or colourless | C. | iron (II) oxide, lead sulphide and copper sulphide may be present |
| 4. | blue | D. | iron (II) chloride or lead (II) oxide may be present |
| 5. | yellow or brown | E. | copper (II) oxide, lead sulphide and copper sulphide may be present |
| 1. | black → E |
| 2. | green → C |
| 3. | white or colourless → B |
| 4. | blue → A |
| 5. | yellow or brown → D |
