JEE Main 2020 — p Block Elements (Group 15, 16, 17 & 18) Question with Solution
JEE Main 2020 (06 Sep Shift 1)
Question
The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is :
Choose an option
Show full solutionCorrect option: D
Correct answer
Dsafe for teeth
Step-by-step explanation
Soluble fluoride is often added to drinking water to make concentration upto 1 ppm because F– ions make the enamel on teeth much harder. But above 2 ppm cause brown mottling of teeth. Cause harmful effect on bones and teeth.
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This is a previous-year question from JEE Main 2020, covering the p Block Elements (Group 15, 16, 17 & 18) chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.