1.

Refer to the given flow chart and identity X, Y and Z.            

A. XYZ\[{{O}_{2}}\]\[C{{O}_{2}}\]\[He\]               
B.       XYZ\[C{{O}_{2}}\]\[{{O}_{2}}\]\[{{N}_{2}}\]               
C.       XYZ\[{{N}_{2}}\]\[C{{O}_{2}}\]\[{{O}_{2}}\]               
D.       XYZ\[{{O}_{2}}\]\[He\]\[C{{O}_{2}}\]
Answer» B.       XYZ\[C{{O}_{2}}\]\[{{O}_{2}}\]\[{{N}_{2}}\]               


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