List three uses of non-metals in everyday life and explain their significance.

Oxygen: Essential for respiration in living organisms and combustion processes. Without oxygen, life as we know it would not exist, and many industrial processes like burning fuels would be impossible.
Nitrogen: Used in fertilizers (e.g., urea, ammonia) for plant growth, and as an inert atmosphere in packaging food items to prevent spoilage. It is crucial for agriculture and food preservation.
Chlorine: Used as a disinfectant for water purification (killing harmful bacteria) and in the production of PVC and bleaching agents. It plays a vital role in public health and various chemical industries.