The gas used to dillute oxygen for breathing by deep sea divers is
(A) Neon
(B) Argon
(C) Nitrogen
(D) Helium
Explanation : Helium is used, since it has very low (almost non-existent) narcotic properties. The Nitrogenin air is highly narcotic at depth and adding Helium allows one to dive without the effects of narcosis (where one’s mind is impaired).
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