What is the composition of the air?

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Air contains only dust and oxygen.

Air contains dust particles, some gases (only oxygen and nitrogen), and water vapour

Air contains gases (oxygen, nitrogen, carbon dioxide, argon, and a small number of other gases), water vapour, smoke, and dust particles

Air contains only oxygen, carbon dioxide, and water vapour

answer is C.

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Detailed Solution

Air contains gases (oxygen, nitrogen, carbon dioxide, argon, and a small number of other gases), water vapour, smoke, and dust particles.
A thin layer of air is present everywhere around us. It is a homogeneous mixture of gases. It contains oxygen, nitrogen, argon, some gases, water vapour, smoke, and dust particles. Gases in the air are mainly oxygen (20.9%) and nitrogen (78.9%). The remaining 0.2% includes gases such as dust, smoke, water vapour, argon, carbon dioxide, and a small number of other gases.

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