A) Oxygen and argon
B) Oxygen and helium
C) Oxygen and nitrogen
D) Oxygen and hydrogen
Correct Answer: B
Solution :
An oxygen-helium mixture is used as artificial respiration in deep sea diving instead of air because nitrogen present in air dissolves in blood under high pressure when sea diver goes into deep sea. When he comes to the surface, nitrogen bubbles out of the blood due to decrease in pressure, causing pains. This disease is called ?bends?.
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