Question

If concentration of fluoride ion is up to 1 ppm then which of the following options may be correct
1) good for teeth
2)harmful for teeth and cause brown motting of teeth
3)harmful for bones and teeth 4)harmful for growth of children​

Answer 1

Harmful hor growth of children

Answer 2

If concentration of fluoride ion is upto 1 ppm then

it is good for teeth.

explanation : Fluoride is an ionic compound which is derived from fluorine , the most reactive element. Fluoride works by binding to tooth enamel. it makes the teeth more resistant to acid attack from bacteria.

95 % of fluoride is used in water supplies.

fluoride is added to public water supplies at an average concentration of about 1 part per million or 1 ppm.

Therefore the concentration of fluoride ion upto 1 ppm is good for teeth.