The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting [3 Ca _ 3 ( PO _ 4 ) _ 2 . Ca (OH) _ 2 ] to:

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Correct answer: D. [3 Ca _ 3 ( PO _ 4 ) _ 2 . CaF _ 2 ]

The recommended concentration of fluoride ion in drinking water is up to $1ppm$ as fluoride ion is required to make teeth enamel harder by converting
$[ 3{Ca}_{3} ( {PO}_{4}{)}_{2} . Ca ( OH{)}_{2} ]$ to $[ 3{Ca}_{3} ( {PO}_{4}{)}_{2} . {CaF}_{2} ]$ .
$[ 3{Ca}_{3} ( {PO}_{4}{)}_{2} . Ca ( OH{)}_{2} ]$ + $2{F}^{-}$ $\to [ 3{Ca}_{3} ( {PO}_{4}{)}_{2} . {CaF}_{2} ]$

The recommended concentration of fluoride ion in drinking water is...

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