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Which of the following is not used as a fluoride compound?

(a) Sodium fluoride

(b) Sodium silico fluoride

(c) Hydrofluosilicic acid

(d) Sodium fluro carbonate

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The above asked question is from Fluoridation and Defluoridation in division Miscellaneous Treatment Methods of Environmental Engineering

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Right option is (d) Sodium fluro carbonate

Best explanation: Sodium fluoride, sodium silico fluoride, hydrofluosilicic acid and sodium fluro carbonate are the fluoride compounds used for fluoridation.

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