A) \[{{O}_{2}}\]
B) \[C{{O}_{2}}\]
C) Helium
D) All of these
Correct Answer: D
Solution :
Oxygen mixed with \[C{{O}_{2}}\] or helium is used for artificial respiration\[({{O}_{2}}+C{{O}_{2}})\]or\[({{O}_{2}}+He)\].
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