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JEE Main & Advanced Chemistry Environmental Chemistry / पर्यावरणीय रसायन Question Bank Mock Test - Environmental Chemistry

  • question_answer
    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) \[3C{{a}_{3}}{{(P{{O}_{4}})}_{2}}.\,3Ca{{F}_{2}}\]

    Correct Answer: C

    Solution :

    [c] Hydroxyapatite is \[3C{{a}_{3}}(P{{O}_{4}})2.Ca{{(OH)}_{2}}.\]  Fluoride converts it into fluorapatite \[3C{{a}_{3}}(P{{O}_{4}})2.Ca{{F}_{2}}.\]


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