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Deficiency of fluoride ion in drinking w...

Deficiency of fluoride ion in drinking water causes

A

Brown mottling of teeth

B

Blue baby syndrome

C

Tooth decay

D

Scurvy

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What should be the tolerable limit of fluoride ions in drinking water ? What happens if it is higher than 10 ppm ?

(a)Which chemical substances is present as enamel on the surface of the teeth ? (b)Traces of fluoride ions (F^-) in drinking water (about 1 ppm) greatly reduce the incidence dental cavities (tooth decay ) . What is the reason for reduction in cavities ?

Knowledge Check

  • Assertion: The deficiency of fluoride in drinking water cause disease such as tooth decay etc. Reason: The F^(-) ions make the enamel on teeth much harder by converting hydroxyapatite, the enamal on the surface of the teeth, into much harder fluorapatite.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true and the reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion is false but reason is true.

  • Deficiency of fluorine in drinking water caused

    A
    dental caries
    B
    dental flourosis
    C
    skeletal fluorosis
    D
    goiter

  • Statement-1: Deficiency of fluoride in drinking water is harmful to human being. and Statement-2: Fluoride concentration more than 10 ppm causes harful effect to bones and teeth.

    A
    Statement-1: is True, Statement-2 is True, Statement-2 is a correct explanantion for Statement-1
    B
    Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
    C
    Statement:1 is True, Statement -2 is False
    D
    Statement-1 is False, Statement-2 is True

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    Which of the following statements are not correct? (i) F^(-) ion concentration above 2 ppm causes brown mottling in teeth. (ii) Excessive F^(-) (over 10 ppm) causes harmful effect to bones and teeth. (iii) Excessive lead in drinking water causes disease methemoglobinemia (iv) Deficiency of sulphate in drinking water causes laxative effect

    The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting [3 Ca_3(PO_4)_2. Ca(OH)_2] to

    The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting [3Ca_(3)(PO_(4))_(2).Ca(OH)_(2)]

    The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teen enamel harder by converting [3Ca_(3) (PO_(4))_(2). Ca(OH)_(2)] to :

    Deficiency of (F^(-)) in drinking water causes tooth decay. Its International Standard limit makes the enamal on tooth much harder by comverting hydroxyapatite into much harder

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