Chemistry - Environmental Chemistry Question with Solution | TestHub
ChemistryEnvironmental ChemistryWater PollutionMedium2 minQB
ChemistryMediumsingle choice
Soluble fluorides is often added in drinking water to bring its concentration to safe because F- ions make the enamal on teeth much harder by covering of :-
Options:
Answer:
D
Solution:
Fluoride ions (F⁻) in small amounts strengthen tooth enamel by forming a hard protective layer.
They react with hydroxyapatite Ca₃(PO₄)₂⋅Ca(OH)₂ present in teeth.
This leads to the formation of fluoroapatite Ca₃(PO₄)₂⋅CaF₂, which is more resistant to decay.
Hence, the correct answer is (D).
Stream:JEESubject:ChemistryTopic:Environmental ChemistrySubtopic:Water Pollution
⏱ 2mℹ️ Source: QB
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