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As far as safer handling is considered, which of the following is used for fluoridation?

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As far as safer handling is considered, which of the following is used for fluoridation?

(a) Sodium fluoride

(b) Sodium silico fluoride

(c) Hydrofluosilicic  acid

(d) Sodium fluro carbonate

I got this question in unit test.

Asked question is from Fluoridation and Defluoridation in section Miscellaneous Treatment Methods of Environmental Engineering

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The correct answer is (c) Hydrofluosilicic  acid

The explanation: For safer handling, hydrofluosilicic acid is preferred as even if it is spilled on the skin, it can be removed easily by washing in cold water.

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