A) Oxygen and helium
B) Oxygen and carbon dioxide
C) Oxygen and nitrogen
D) Hydrogen and oxygen
Correct Answer: A
Solution :[a] The most commonly used mixture of gases in diving apparatus is nitrox also referred to as Enriched Air Nitrox, which is with extra oxygen about 32% to 36% and thus less nitrogen than atmospheric air, reducing the risk of decompression sickness or bends. Taking nitrogen, oxygen mixture = during scuba diving etc. body in under high pressure. This high external pressure causes the nitrogen to get mixed with blood! Which then changes to toxic chemicals! Being fatal. Taking helium + oxygen = Even if helium got mixed with blood it will not cause any problem as helium is inert! Also helium is light. Hence causing the tank to be light.
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