JEE Main 2025 (Online) 22nd January Evening Shift | Biomolecules Question 19 | Chemistry

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.

$$\left[3\left(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2\right) \cdot \mathrm{CaF}_2\right]$$

$$\left[3\left(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2\right) \cdot \mathrm{Ca}(\mathrm{OH})_2\right]$$

$$\left[3\left(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_3\right) \cdot \mathrm{CaF}_2\right]$$

$$\left[3\left(\mathrm{Ca}_2\left(\mathrm{PO}_4\right)_2\right) \cdot \mathrm{Ca}(\mathrm{OH})_2\right]$$

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