A) \[{{O}_{2}}\] and \[{{N}_{2}}O\]
B) \[{{O}_{2}}\] and \[He\]
C) \[{{O}_{2}}\] and \[N{{H}_{3}}\]
D) \[{{O}_{2}}\] and \[CO\]
Correct Answer: B
Solution :
A mixture of \[{{O}_{2}}\] and He is used for respiration as helium is inert and light gas and diffuse rapidly.
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