No
reason for air is not pure
air is not pure
no
no
air around us is not pure because in air so many gases are mixed like nitrogen , oxygen , carbon etc.
Air contains about 19-20% oxygen
With today's kind of pollution. It's not anymore.
No, but since carbon dioxide is everywhere in the air around us it is very hard to obtain pure water.
A pure air can be prepared only in laboratory, by mixing the components. Note that air is not a compound but a mixture of gases. In the nature pure air don't exist - the air is polluted.
No, due to pollution the composition of air changes due to industrial emission,automobile exhaust .
The air inside a hot air balloon is the same as normal air around the balloon and the air you're breathing, only heated by the flame inside the balloon, hence HOT AIR balloon.
Pure air is homogeneous because all components are completely miscible.