Excess fluoride (over 10 ppm) in drinking water can cause

Harmful effect on bones and teeth

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Methemoglobinemia

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Kidney damage

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Laxative effect

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Solution

The correct option is B Harmful effect on bones and teeth
Excess amounts of fluoride in the drinking water affect the bones and teeth. This is due to a disease called the fluorosis that is characterized by the calcification of bones and yellow teeth. Hence the correct answer is option A.

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