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| Q. |
Which of the following is the pure compound? |
| A. | sodium fluoride |
| B. | sodium silico fluoride |
| C. | hydrofluosilicic acid |
| D. | sodium fluro carbonate |
| Answer» A. sodium fluoride | |
| Explanation: sodium fluoride is the most purest compound having 95-98% purity due to which, they are commonly used for fluoridation. | |
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