(b).
| Cadmium chloride | 1% pet. | Yellow |
| Chromium oxide | 2% aqua | Green |
| Mercury metal | 0.5% pet. | Red |
| Copper sulfate | 1% aqua | Blue |
| Ferric oxide | 2% pet. | Black |
| Aluminium chloride | 2% pet. | Purple |
| Zinc metal | 1% pet. | White |
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