Deficiency of F− in drinking water causes tooth decay. Its International Standard limit makes the enamel on tooth much harder by converting hydroxyapatite into much harder
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a
Ca3(PO4)2 . CaF2
b
Ca3(PO4)2 . 3CaF2
c
3Ca3(PO4)2 . CaF2
d
3Ca3(PO4)2 . 3CaF2
answer is C.
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Detailed Solution
Hydroxyapatite is 3Ca3(PO4)2.Ca(OH)2. Fluoride converts it into fluorapatite 3Ca3(PO4)2.CaF2.