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Deficiency of (F^(-)) in drinking water ...

Deficiency of `(F^(-))` in drinking water causes tooth decay. Its International Standard limit makes the enamal on tooth much harder by comverting hydroxyapatite into much harder

A

`Ca_(3)(PO_4)_(2).CaF_(2)`

B

`Ca_(3)(PO_4)_(2).3CaF_(2)`

C

`3Ca_(3)(PO_4)_(2).CaF_(2)`

D

`3Ca_(3)(PO_4)_(2).3CaF_(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
Hydroxyapatite is `3Ca(PO_4)_(2).Ca(OH)_(2)`. Fluoride converts it into fluorapatite `3Ca_(3)(PO_4)_(2).CaF_(2)`.
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Assertion: The deficiency of fluoride in drinking water cause disease such as tooth decay etc. Reason: The F^(-) ions make the enamel on teeth much harder by converting hydroxyapatite, the enamal on the surface of the teeth, into much harder fluorapatite.

A2Z-ENVIRONMENTAL CHEMISTRY-Section D - Chapter End Test
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