Question

What is the most common gas in the air?

Answer 1

Air is the one of the important things in our life. In the world, without air nothing is surveyed. For human beings, breathing air is the important thing for inhaling and exhaling. For human respiration, oxygen is used for inhalation of breathing and carbon dioxide is exhaled gas. This inhale and exhale gas are important for human lifestyle to survey in the world. Each and every gas has unique properties and unique nature in the atmosphere. One gas is not able to replace another gas in the environment.

Complete step by step answer:
As we know that the air is nothing but a mixture of the gases. The mixture of the gas in the air is major in the form of nitrogen, oxygen, carbon dioxide and other gases.
In the atmosphere approximately $78\%$ of nitrogen, $21\%$ of oxygen and remaining $1\%$ of other gases in the world.
The symbol of nitrogen is ${\text{N}}$ and oxygen is ${\text{O}}$.
The natural form of nitrogen and oxygen gases are diatomic. The symbol of diatomic nature of nitrogen and oxygen gases are ${{\text{N}}_2}$ and ${{\text{O}}_{\text{2}}}$.

Note: We have to remember that the chemical properties of the gas depend on the mixture of gases. All the gases are not helpful for the human body. Some gases are poison for the human body. It leads to death also. For example, wrong inhalation of carbon dioxide in the human body leads to death. Some cyanide gases and mono and dioxide gases also lead to human death in the world. In plants, day time inhales carbon dioxide from the atmosphere and exhales oxygen, but in night time inhales oxygen and exhales carbon dioxide.