InterviewSolution
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InterviewSolution
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Assertion : Soluable fluoride is often added to drinking water to bring its concentration up to 1 ppm. Reason : `F^(-)` ion concentration above 2 ppm causes brown mottling of teeth.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the c orrect explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - b `F^(-)` ions make the enamel on teeth much harder by converting hydroxyapatite, the enamel on the surface of the teeth, into much harder fluorapatite ` [ 3 ( Ca_(3) (PO_(4)) _(2)) .Ca (OH)_(2)], ` the enamel on the surface of the teeth , into much harder fluorapatite ` [ 3 (Ca_(3) (PO_(4))_(2)).CaF_(2)].` |
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