Question

Mention three points to justify that air is a mixture and not a compound

Answer 1

Air is a mixture and not a compound because:
1. Air can be separated by physical means which isn't possible in compounds.
2. Air is heterogenous, as its composition varies from time to time.
3. Air can be prepared by mixing gases in a proportion which is present at a place. This is a physical process as there is no energy being formed.

Answer 2

1. compounds will have a same to same chemical properties and physical properties
2. compounds cannot be separated by physical process where as is mixture are separated by physical process
3. compounds are heterogeneous where as mixtures are homogeneous