The components constituting the air mixture are

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Only dust and oxygen.

Dust particles, some gases (only oxygen and nitrogen), and water vapour.

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

Only oxygen, carbon dioxide, and water vapour.

answer is C.

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Detailed Solution

Air contains gases such as oxygen, nitrogen, carbon dioxide, argon, and a small number of other gases, then water vapour, smoke, and dust particles.
All around us, a thin layer of air is there. It contains several gases, including smoke, dust, and water vapour. Among the gases in the air, oxygen (20.9%) and nitrogen (78.9%) make up the majority. Gases like argon, carbon dioxide, and a select few other gases make up the final 0.2%.

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