Q. Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen.
Reason : The reaction between nitrogen and oxygen requires high temperature.

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Solution:

Nitrogen and oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen.
This is because the reaction between nitrogen and oxygen requires high temperature to overcome the activation energy barrier.
Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.