Question

What are the two conditions under which nitrogen will react with oxygen?

Answer 1

High temperatures and high pressures

Explanation:

In high temperatures, like near lightning bolts, nitrogen gas (`N_2`) reacts with oxygen gas in the air (`O_2`) to create nitrogen monoxide (`NO`).

`N_2+O_2 -> 2NO`

Source:

http://chemistry.elmhurst.edu/vchembook/307nitrogen.html