what would happen if nitrogen is replaced with oxygen in the atmosphere
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Answer:
What would happen if all the nitrogen in the air were replaced with oxygen?
Everyone Dies™.
OK, so this one isn’t as bad as replacing N2 with H2, but making our atmosphere essentially pure oxygen is a terrible idea.
For starters, fires now burn with incredible intensity and almost nothing is required to start them. Lightning, sparks from touching door knobs, actual fires - all of them start intense new fires. Every forest, all the grass, and every animal on land bursts into flames.
It gets worse.
The heat given off by all of this burning raises global temperatures enough to start boiling off the oceans. In addition, all of the burned material is now mostly atmospheric CO2 and H2O, and these are potent greenhouse gases. The Earth gets heated up and stays heated up. Solar radiation gets trapped and the temperature rises further. All of the CO2 in the oceans comes fizzing out, trapping more heat, baking the rocks, releasing CO2, trapping more heat…
Venus 2.0
Our Earth is converted into an easy-bake planet, complete with stifling temperatures (somewhere in the 500C range), enormous atmospheric pressure (dozens of atmospheres), and almost certainly devoid of life. Luckily we’re all dead long before the rest happens.