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Chemistry miscellaneous
  1. The inert gas which is substituted for nitrogen in the air used by deep sea divers for Breathing is:
    1. Neon
    2. Argon
    3. Krypton
    4. Helium
Correct Option: D

Helium is used since it has very low (almost nonexistent) 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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