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A. Argon
B. Xenon
C. Helium
D. Krypton

Submitted by: Rashid Mehmood

Heliox is a mixture of oxygen and helium and is often used in the deep phase of a commercial deep dive to eliminate nitrogen narcosis. Heliair is a form of trimix that is easily blended from helium and air without using pure oxygen. It always has a 21:79 ratio of oxygen to nitrogen; the balance of the mix is helium.

Correct Answer: Helium

Last Updated: January 08, 2020