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The \({\mathrm{F}}^{-}\)ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surfac…

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The \({\mathrm{F}}^{-}\)ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula

[JEE Main 2024, 9 Apr (Shift 1)]

a

\(\left[3\left({\mathrm{Ca}}_{2}{\left({\mathrm{PO}}_{4}\right)}_{2}\right)\cdot \mathrm{Ca}(\mathrm{OH}{)}_{2}\right]\)

b

\(\left[3\left({\mathrm{Ca}}_{3}{\left({\mathrm{PO}}_{4}\right)}_{2}\right)\cdot {\mathrm{CaF}}_{2}\right]\)

c

\(\left[3\left({\mathrm{Ca}}_{3}{\left({\mathrm{PO}}_{4}\right)}_{2}\right)\cdot \mathrm{Ca}(\mathrm{OH}{)}_{2}\right]\)

d

\(\left[3\left({\mathrm{Ca}}_{3}{\left({\mathrm{PO}}_{4}\right)}_{3}\right)\cdot {\mathrm{CaF}}_{2}\right]\)

✓ Correct answer: b)

\(\left[3\left({\mathrm{Ca}}_{3}{\left({\mathrm{PO}}_{4}\right)}_{2}\right)\cdot {\mathrm{CaF}}_{2}\right]\)

Explanation

Fluoroapatite \(\Rightarrow \left[3{\mathrm{Ca}}_{3}{\left({\mathrm{PO}}_{4}\right)}_{2}.{\mathrm{CaF}}_{2}\right]\)

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