Chemistry · Metallurgy

JEE Main 2024 — 9 April, Shift 1 — Question 64

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.

Option A:
$\left[ 3\left( \text{C}{{\text{a}}_{3}}{{\left( \text{P}{{\text{O}}_{4}} \right)}_{2}} \right)\cdot \text{Ca}{{\text{F}}_{2}} \right]$
Correct
Option B:
$\left[3\left(\mathrm{Ca}_{2}\left(\mathrm{PO}_{4}\right)_{2}\right) \cdot \mathrm{Ca}(\mathrm{OH})_{2}\right]$
Option C:
$\left[3\left(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{3}\right) \cdot \mathrm{CaF}_{2}\right]$
Option D:
$\left[3\left(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}\right) \cdot \mathrm{Ca}(\mathrm{OH})_{2}\right]$

Answer: A

Step-by-step solution

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

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 9 April, Shift 1
Subject: Chemistry
Chapter: Metallurgy
Topic: Introduction and Overview