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What is the formula of the product for...

What is the formula of the product formed when `F^-` reacts with enamel on teeth ?

A

`CaSO_4 . CaF_2`

B

`3Ca_3(PO_4)_2.PF_2`

C

`CaSO_4. CaF_2`

D

`3[Ca_3(PO_4)_2.CaF_2]`

Text Solution

Verified by Experts

The correct Answer is:
D
Enamel of teeth = `Ca_10 (PO_4)_6 (OH)_2`
It reacts with `F^-`
`Ca_10(PO_4)_6 (OH)_6 + 2F^(-) to Ca_10(PO_4)_6 F_2 + 2OH^-`
[ or `3[Ca_3 (PO_4)_2 . CaF_2] + 2OH^-`]
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