Question

give 3 reason to prove that air is a mixture not a compound

Answer 1

hello,
question-
1. Air can be separated into its constituents by fractional distillation of air eg oxygen,nitrogen etc.
2.Air has a variable composition of different constituents eg. 78% nitrogen,21% oxygen,1% other gases 
3.Air shows all properties of its constituents. eg. combustion is due to oxygen and oxygen is present in air.