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JEE Main 202126 AugustMorning Shift

Exam: JEE Main
Year: 2021
Date: 26 August
Shift: Morning Shift
Subject: Chemistry
Chapter: Environmental Chemistry

JEE Main 2021 · 26 August · Morning Shift · Chemistry · Environmental Chemistry

The conversion of hydroxyapatite occurs due to presence of F ^ -...

The conversion of hydroxyapatite occurs due to presence of

{F}^{-}

ions in water. The correct formula of hydroxyapatite is:

Options

A $\left[{Ca}_{3}{\left({PO}_{4}\right)}_{2} \cdot {CaF}_{2}\right]$
B $\left[3{Ca}_{3}{\left({PO}_{4}\right)}_{2} \cdot Ca ( OH{)}_{2}\right]$
C $\left[3{Ca}_{3}{\left({PO}_{4}\right)}_{2} \cdot {CaF}_{2}\right]$
D $\left[3Ca ( OH{)}_{2} \cdot {CaF}_{2}\right]$

Correct answer

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

Step-by-step solution

Hydroxyapatite

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

Hydroxyapatite in presence of

{F}^{-}

ions converts to fluorapatite \left[3{Ca}_{3}{\left({PO}_{4}\right)}_{2} \cdot {CaF}_{2}\right].

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