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Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?

August 29, 2021March 11, 2019 by admin

Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?

A. Mercury
B. Lead
C. Fluoride
D. Arsenic

Categories Chemical Environmental Engineering

Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?

A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of _____________ high above earth’s atmosphere, which absorbs it?

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