What is the total percentage of nitrogen gas in the air?
(a) 12 per cent
(b) 21 per cent
(c) 78 per cent
(d) 87 per cent
Answer: (c) The total percentage of nitrogen gas in the air is 78 percent. Nitrogen is used to concentrate liquid samples and reduce their volume. The chemical industry relies on it as well. Fertilizers, nitric acid, nylon, colors, and explosives are all made with it.