A) \[N{{H}_{3}}\]
B) \[{{N}_{2}}\]
C) \[C{{O}_{2}}\]
D) \[{{O}_{2}}\]
Correct Answer: A
Solution :
m. wt. of \[N{{H}_{3}}=17\]; m.wt. of \[{{N}_{2}}=28\] m.wt. of \[C{{O}_{2}}=44\]; m.wt. of \[{{O}_{2}}=32\] beacuse \[N{{H}_{3}}\]is lightest gas out of these gases \[\left[ r\propto \frac{1}{\sqrt{\text{Molecular}\,\text{Weight}}} \right]\]
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