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Q.

The permissible limit of fluoride ion in drinking water is?

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a

1.5 ppm   

b

10 ppm   

c

20 ppm   

d

25 ppm 

answer is A.

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Detailed Solution

●        The International standards for drinking water mentions the permissible limit of fluoride ion in drinking water is upto 1.5 ppm.
●        Human tooth decay is brought on by a lack of fluoride.
●        Water fluoridation is a method which ensures controlled addition of soluble fluoride to the drinking water supply to bring its concentration upto 1.5 ppm.
 
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