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| Q. |
Which of the following is not used for defluoridation? |
| A. | calcium phosphate |
| B. | copper sulfate |
| C. | alum |
| D. | bone charcoal |
| Answer» B. copper sulfate | |
| Explanation: copper sulfate is used to remove taste, odor, color and control of algae growth and it is not used for fluoridation. | |
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