Carbon dioxide is in fire fighting and is also used to make fizzy drinks.
Nitrogen is used to make fertilisers which are added to the soil for better growth of plants and is used to package food items like chips to keep them fresh for a long time.
Helium gas, being light in weight, is used to fill weather balloons.
Some inert gases are filled into bulbs and lamps to make coloured lights.
In combustion
In generating electricity by rotating the wind mills.