Question

The substances which get oxidised easily can be kept for longer duration by:

A. Adding oxygen and keeping them in sun for few days.

B. Adding nitrogen and keeping them in sun for few days. 

C. Adding oxygen and keeping them in airtight containers. 

D. Adding nitrogen and keeping them in airtight containers.

Answer 1

Nitrogen is an antioxidant which prevents oxidation. By keeping food in airtight containers by adding nitrogen helps to slow oxidation.

By keeping the fat/oil containing food materials in an open area or by adding oxygen can cause rancidity.