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Question

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ions are required to make teeth enamel harder by converting [3Ca3(PO4)2.Ca(OH)2] to

A
[3Ca(OH)2.CaF2]
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B
CaF2
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C
[3(CaF2).Ca(OH)2]
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D
[3Ca3(PO4)2.CaF2]
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Solution

The correct option is D [3Ca3(PO4)2.CaF2]
Tooth enamel is chemically calcium phosphate hydroxyapatite.

In the process of demineralization of teeth, flourine converts calcium phosphate hydroxyapatite to calcium phosphate fluorapatite.

3Ca3(PO4)2.Ca(OH)2+2F3[Ca3(PO4)2.CaF2+2OH


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