A) \[{{O}_{2}}\] and \[He\]
B) \[{{O}_{2}}\] and \[Ar\]
C) \[{{O}_{2}}\]and \[C{{O}_{2}}\]
D) \[C{{O}_{2}}\]and \[Ar\]
Correct Answer: A
Solution :
Mixture of \[{{O}_{2}}\] and \[{{H}_{2}}\] in \[1:4\] ratio is used by deep sea divers for respiration because He does not dissolve in blood at high deep sea pressure.
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