[Solved] The inert gas which is substituted for nitrogen in the air used by deep sea divers for Breathing is:

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Q.	The inert gas which is substituted for nitrogen in the air used by deep sea divers for Breathing is:
A.	Neon
B.	Argon
C.	Krypton
D.	Helium
Answer» D. Helium
Explanation: Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in 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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