JEE Main · 2024 · 09 Apr 2024 · Shift 1 · s-Block Elements

The

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.

(A) $[3 (Ca_{3} (PO_{4})_{2}) \cdot CaF_{2}]$ ✓ Correct
(B) $[3 (Ca_{2} (PO_{4})_{2}) \cdot Ca (OH)_{2}]$
(C) $[3 (Ca_{3} (PO_{4})_{3}) \cdot CaF_{2}]$
(D) $[3 (Ca_{3} (PO_{4})_{2}) \cdot Ca (OH)_{2}]$

Answer: (A)

Solution

Fluoride converts hydroxyapatite into fluoroapatite,

[3 (C a_{3} (P O_{4})_{2}) \cdot C a F_{2}]

. Option (1).

JEE Main · 2024 · 09 Apr 2024 · Shift 1 · Single correct option

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