Flouride in drinking water causes harmful effect on bones and teeth when its concentration becomes:

greater than 10 ppm

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less than 1 ppm

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greater than 15 ppm

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greater than 2 ppm

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Solution

The correct option is A greater than 10 ppm
The World Health Organization (WHO) notes that long-term exposure to drinking water that contains more than 1.5 ppm fluoride can lead to health problems. The WHO's guideline limit is 1.5 ppm.
Hence, Flouride concentration in drinking water grater than 2ppm can cause harmful effects on bones and teeth.
Option D is correct.

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