A) \[[3C{{a}_{3}}{{(P{{O}_{4}})}_{2}}\cdot Ca{{F}_{2}}]\]
B) \[[3\{Ca{{(OH)}_{2}}\}\cdot Ca{{F}_{2}}]\]
C) \[[Ca{{F}_{2}}]\]
D) \[[3(Ca{{F}_{2}})\cdot Ca{{(OH)}_{2}}]\]
Correct Answer: A
Solution :
The \[{{\text{F}}^{\text{--}}}\] ion makes the enamel on teeth much harder by converting hydroxyapatite\[\text{ }\!\![\!\!\text{ 3C}{{\text{a}}_{\text{3}}}{{\text{(P}{{\text{O}}_{\text{4}}}\text{)}}_{\text{2}}}\text{.Ca(OH}{{\text{)}}_{\text{2}}}\text{ }\!\!]\!\!\text{ }\] into much harder Fluor apatite\[\text{ }\!\![\!\!\text{ 3C}{{\text{a}}_{\text{3}}}{{\text{(P}{{\text{O}}_{\text{4}}}\text{)}}_{\text{2}}}\text{.Ca}{{\text{F}}_{\text{2}}}\text{ }\!\!]\!\!\text{ }\].
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