Question

if air only has nitrogen gas?
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Answer 1

Answer:

no

Explanation:

because there are several gases present in air like oxygen , carbon dioxide , water vapour or many other gases.

Answer 2

Explanation:

Nitrogen is an inert gas — meaning it doesn't chemically react with other gases — and it isn't toxic. But breathing pure nitrogen is deadly. That's because the gas displaces oxygen in the lungs. Unconsciousness can occur within one or two breaths, according to the U.S. Chemical Safety and Hazard Investigation Board.