Question
How an ore is concentrated by froth floatation process?

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| Solution | pH value |
| P | 12 |
| Q | 2 |
| R | 7 |

| S.No. | Substance added | Gas Evolved | Odour |
| 1 | Calcium carbonate | ______ | ______ |
| 2 | Magnesium ribbon | ______ | ______ |
| 3 | Manganese (IV) oxide with heating | ______ | ______ |
| 4 | Sodium Sulphide | _______ | _______ |
