A) \[{{O}_{2}}+He\]
B) \[{{O}_{2}}+Xe\]
C) \[{{O}_{2}}+Ar\]
D) \[{{O}_{2}}+{{N}_{2}}\]
Correct Answer: A
Solution :
A mixture of 80% helium and 20% oxygen is used by sea divers for respiration as helium is not soluble in blood even under high pressure below the waters, unlike nitrogen.
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