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NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Chemistry
Chapter: Environmental Chemistry

NTA Abhyas 2020 · Chemistry · Environmental Chemistry

The recommended concentration of fluoride ion in drinking water is...

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting

[ 3C{a}_{3}{\left(P{O}_{4}\right)}_{2}. Ca{\left(OH\right)}_{2} ]

to

Options

A $[ 3 \left(Ca \left(OH{)}_{2}\right). Ca{F}_{2}\right]$
B $\left[Ca{F}_{2}\right]$
C $\left[3 \left(Ca{F}_{2}\right). Ca{ \left(OH\right)}_{2}\right]$
D $[ 3C{a}_{3} \left(P{O}_{4}{)}_{2}. Ca{F}_{2}\right]$

Correct answer

D. $[ 3C{a}_{3} \left(P{O}_{4}{)}_{2}. Ca{F}_{2}\right]$

Step-by-step solution

[ 3C{a}_{3} ( P{O}_{4}{)}_{2}. Ca\left(OH{)}_{2}\right] + 2F^{-} \to \left[3C{a}_{3}{\left(P{O}_{4}\right)}_{2}. Ca{F}_{2}\right] + 2OH^{-}

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