The lightest gas is

The lightest gas is
  1. $\mathrm{N}_{2}$
  2. Ar
  3. Rn
  4. $\mathrm{He}$

Solution

The lightest gas is hydrogen $(\mathrm{H})$. Tos atomic weight is $1.008$. But among the mentioned gases
lightest one is helium (He). Its atomic weight is $4.003$. ,

Asked in: JEE-TOPICTESTS-CHEMISTRY

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