A) Air
B) \[N{{H}_{3}}\]
C) \[N{{O}_{2}}\]
D) \[HN{{O}_{3}}\]
Correct Answer: A
Solution :
Birkeland-Eyde process: Dinitrogen is prepared commercially from air by liquefaction and fractional distillation. When liquid air is allowed to distil, dinitrogen having lower b.pt. (77 K) distils over first leaving behind liquid oxygen (b.pt. 90 K). World-wide production of dinitrogen from liquid air is more than 50 million tones per year.
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