Environmental Chemistry Question 74
Question: Deficiency of ( $ {F^{-}} $ ) in drinking water causes tooth decay. Its International 8tandard 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}.3CaF_2 $
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Hydroxyapatite is $ 3Ca_3(PO_4)2.Ca{{(OH)}_2}. $ Fluoride converts it into fluorapatite $ 3Ca_3(PO_4)2.CaF_2. $
BETA
