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
3Ca3PO42.CaF2
b
3CaF2CaOH2
c
3CaOH2.CaF2
d
Ca3PO42.CaOH2
answer is A.
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Detailed Solution
Hard material on teeth is enamel. That is 3Ca3PO42.CaF2
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