Give answer to the following questions:
Keerthi bought two packets of potato chips. One packet was tightly sealed and filled with nitrogen gas, while the other packet had a small tear and was exposed to air. After a few days, the chips in the torn packet developed an unpleasant smell.
1. What is the role of nitrogen gas in chip packets?
2. Why did the chips in the sealed packet not spoil quickly?
3. What chemical change will occur in the open sample?