Question

composition of air ?

Answer 1

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Answer 2

Answer:

Air is not a single substance. It is a mixture of several gases.

Clean air contains about 78 per cent nitrogen, 21 per cent oxygen and 1 per cent other gases like Carbon di oxide (CO2), argon, helium, hydrogen, methane (CH4), Neon etc.

Air also contains smoke, dust, water vapour in the air may vary According to the environment.