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Q.

A dental disease characterized by mottling of teeth is due to presence of a certain chemical element in drinking water. Which is that element.

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a

Boron

b

Chlorine

c

Fluorine

d

Mercury

answer is C.

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Detailed Solution

The excess of fluorine in water causes fluorosis. The symptoms of fluorosis are mottling of teeth and abnormal bones liable to fracture etc.
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