Fluorosis (a bone disease) is caused by the presence of high concentra – McqOptions

MCQOPTIONS

1.	Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?
A.	Hydrocarbons
B.	Hydrogen fluoride
C.	Hydrogen sulphides
D.	Nitrogen dioxide
Answer» C. Hydrogen sulphides

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