A) \[{{N}_{2}}\]
B) \[Ar\]
C) \[Rn\]
D) He
Correct Answer: D
Solution :
Key Idea: The gas with lowest atomic mass is lightest gas. The atomic mass of given choices are as follows \[{{\text{N}}_{\text{2}}}\]atomic mass = 14.006 Ar atomic mass = 39.948 Rn atomic mass = 222.0 He atomic mass =4.003 \[\therefore \]He is the lightest gas.
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