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| Q. |
How many grams of MgCO3 dissolved per litre gives 84 ppm hardness? |
| A. | 70.56 mg/l |
| B. | 48.23 mg/l |
| C. | 81.49mg/l |
| D. | 66.12 mg/l |
| Answer» A. 70.56 mg/l | |
| Explanation: 70.56 mg/l of mgco3 dissolved per litre gives 84 ppm hardness. | |
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