A) \[{{O}_{2}}+He\]
B) \[{{O}_{2}}+{{X}_{e}}\]
C) \[{{O}_{2}}+Ar\]
D) \[{{O}_{2}}+{{N}_{2}}\]
Correct Answer: A
Solution :
Helium is not soluble in blood even under high pressure, a mixture of 80% helium and 20% oxygen is used instead of ordinary air by sea divers for respiration.
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