Question

Why there is Nitrogen in packets of chips

Answer 1

This is done to prevent the chips from oxidizing, which is part of what makes them go stale. Oxygen is very reactive, and likes to combine with other molecules whenever it can, causing chemical changes to take place. 

Answer 2

Nitrogen is relatively cooler than normal air so presence of $N_2 O$ keeps them fresh
$O_2$ also oxidises the chips which drastically decreases the shelf life

Please mark as brainliest