Discussion
Air is a/an?
Answer: B
Air is a mixture, not a compound. Its constituents are not combined in any fixed proportion and retain their own properties.
It is about 78 per cent nitrogen, 21 per cent oxygen and 0.93 per cent argon, with carbon dioxide, water vapour and traces of other gases. Each can be separated by physical means, by fractional distillation of liquid air.
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