Question

Does gases present in the atmosphere could be differentiated into ideal and real gases?

Answer 1

Read the full paragraph.
To answer that question you need to know the basic assumptions made to derive ideal gas concept.
They are;
1)The volume of the individual gas molecules is negligible compared to the volume of the smallest open ball containing all the molecules.
2)The rapidly moving particles constantly collide among themselves and with the walls of the container. All these collisions are perfectly elastic. This means, the molecules are considered to be perfectly spherical in shape, and elastic in nature.
3)Except during collisions, the interactions among molecules are negligible. (That is, they exert no forces on one another).

The gases which follow these assumptions are called ideal gases. It is only a hypothetical concept.

In reality molecules do interact with each other and may or may not have volume negligible to vacant volume around them. The gases which do exist are called real gases.

However at high temperature and pressure gas molecules are so far apart that interactions among them are negligible and so is their relative volume.

Therefore, it is said that under such conditions real gases behave ideally.