The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is : (A) harmful to — JEE Mains Chemistry Past Papers Chemistry Question
Question
The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is : (A) harmful to bones (B) harmful to skin (C) safe for teeth (D) harmful for teeth
Answer: C
💡 Solution & Explanation
NCERT XI-Part-II-Page No.408 (Environmental Chemistry) Soluble fluoride is often added to drinking water to make concentration upto 1 ppm because F– ions make the enamel on teeth much harder. But above 2 ppm cause brown mottling of teeth. Cause harmful effect on bones and teeth.
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