A) \[{{N}_{2}}\]
B) \[Ar\]
C) \[Rn\]
D) \[He\]
Correct Answer: D
Solution :
The lightest gas is hydrogen\[(H)\]. Its atomic weight is 1.008. But among the mentioned gases lightest one is helium\[(He)\]. Its atomic weight is\[4.003\].You need to login to perform this action.
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