Verified Solution • 2025–26 Session moderate

QJEEM24Che841: JEE Main 2024 Chemistry - Class 12 JEEM24Che841 Solution: The ions make the enamel on teeth much harder by converting…

The F−\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.

Multiple Choice Options

  • A [3(Ca3(PO4)2)⋅CaF2]\left[3\left(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2\right) \cdot \mathrm{CaF}_2\right]
  • B [3(Ca3(PO4)2)⋅Ca(OH)2]\left[3\left(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2\right) \cdot \mathrm{Ca}(\mathrm{OH})_2\right]
  • C [3(Ca3(PO4)3)⋅CaF2]\left[3\left(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_3\right) \cdot \mathrm{CaF}_2\right]
  • D [3(Ca2(PO4)2)⋅Ca(OH)2]\left[3\left(\mathrm{Ca}_2\left(\mathrm{PO}_4\right)_2\right) \cdot \mathrm{Ca}(\mathrm{OH})_2\right]

Step-by-Step Verified Solution

Hydroxyapatite : [3(Ca3(PO4)2)⋅Ca(OH)2]\left[3\left(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2\right) \cdot \mathrm{Ca}(\mathrm{OH})_2\right]

Fluoroapatite : [3(Ca3(PO4)2)⋅CaF2]\left[3\left(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2\right) \cdot \mathrm{CaF}_2\right]

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