in short the answer is air is made of oxygen nitrogen carbon dioxide water vapour and dust particles this are different proportion so is mixture of various gases
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Aditya Ravi answered this
Air is composed of various gasses, but they are mainly composed of Nitrogen, Oxygen and small particals of water drops. Other gasses are Argon, C.O
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Lisa answered this
As air is made up of many gases in different proportion.
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Mrityunjay Jha answered this
In air their are different types of gases like O?,N?,H?,etc therefore it is said to be homogeneous mixture