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  4. The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is :

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Q. The presence of soluble fluoride ion upto $1 ppm$ concentration in drinking water, is :

JEE MainJEE Main 2020Environmental Chemistry

Solution:

$F ^{-}$ ion conentration up to $1 \,ppm$ in drinking water is safe for teeth, but $F ^{-}$ ion concentration above $2 \, ppm$ is harmfull for teeth and above $10 \, ppm$ is harmfull for bones.