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Q.

Fluoride ion deficiency in water causes diseases such as tooth decay. Soluble fluoride is often passed to drinking water to bring its concentration upto 11 PPM to from hard material on teeth.The formulae of the hard substance is

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a

$[3 {Ca}_{3} {({PO}_{4})}_{2} . {CaF}_{2}]$

b

$[3 ({CaF}_{2}) Ca {(OH)}_{2}]$

c

$[{Ca}_{3} {({PO}_{4})}_{2} . Ca {(OH)}_{2}]$

d

$[3 (Ca {(OH)}_{2} . {CaF}_{2})]$

answer is A.

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Detailed Solution

Hard material on teeth is enamel. That is $[3 {Ca}_{3} {({PO}_{4})}_{2} . {CaF}_{2}]$

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Fluoride ion deficiency in water causes diseases such as tooth decay. Soluble fluoride is often passed to drinking water to bring its concentration upto 11 PPM to from hard material on teeth.The formulae of the hard substance is