Question

Why air is a homogeneous mixture of various gases?

Answer 1

First think what is homogeneous mixture?
A homogeneous mixture is a mixture which contains a definite proportion of substances at every instance. 
Now move on to topic.
Air is a homogeneous mixture of gases as gases present in it are in a definite proportion by volume.
e.g., if you air from somewhere you will find the percentage of oxygen be 20.9 % and that of nitrogen be 78%. 

#Rehan Ahmad XLX

Answer 2

Yes, air is a homogeneous mixture mainly of oxygen and nitrogen . It's elements are not easily separated from any other.