Environmental Chemistry Question 74
Deficiency of ( $ {F^{-}} $ ) in drinking water causes tooth decay. Its International Standard limit makes the enamel on tooth much harder by converting hydroxyapatite into much harder
Options:
A) $ Ca_3{{(PO_4)}_2}.CaF_2 $
B) $ Ca_3{{(PO_4)}_2}.3CaF_2 $
C) $ 3Ca_3(PO_4)_2.CaF_2$
D) $ 3Ca_3(PO_4)_2\cdot3CaF_2 $
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Answer:
Correct Answer: C
Solution:
Hydroxyapatite is $ Ca_5(PO_4)_3OH. $ Fluoride converts it into fluorapatite $ Ca_5(PO_4)_3F. $
BETA
