1.

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

A. \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}.\,Ca{{F}_{2}}\]
B. \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}.\,3Ca{{F}_{2}}\]
C. \[3C{{a}_{3}}{{(P{{O}_{4}})}_{2}}.\,Ca{{F}_{2}}\]
D. \[3C{{a}_{3}}{{(P{{O}_{4}})}_{2}}.\,3Ca{{F}_{2}}\]
Answer» D. \[3C{{a}_{3}}{{(P{{O}_{4}})}_{2}}.\,3Ca{{F}_{2}}\]


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