# The gas mixture used by deep sea divers for respiration is:(A) ${{\text{O}}_{\text{2}}}{\text{ + }}{{\text{N}}_{\text{2}}}$ (B) ${{\text{O}}_{\text{2}}}{\text{ + He}}$(C) ${\text{Xe + }}{{\text{O}}_{\text{2}}}$(D) ${{\text{O}}_{\text{2}}}{\text{ + Ar}}$

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Hint: Underwater diving is used to refer to the descending below the surface of the water to interact with the environment. Deep sea diving is underwater diving with surface supplied equipment. It is a very risky human activity as the diver is exposed to a wide range of hazards, such as breath-hold endurance limitations. Generally, heliox is used as a medical treatment for patients with difficulty in breathing.