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Question

 Is air a pure substance ? Or a compound or mixture.


Solution

Air  is not a pure substance.  Air is a mixture of gases, mainly nitrogen (78.09%), and oxygen, but containing much smaller amounts of water vapor, argon, and carbon dioxide  and very small amounts of other gases.  Anything that is a  mixture' is  not a pure substance.

Air is a mixture and not a compound because  air can be separated into its constituents such as oxygen, nitrogen etc. by fractional distillation of liquid air.  Air shows the properties of all the gases present in it.
Whereas a compound is a chemical substance that forms when two or more different elements combine in a fixed ratio. Water ( H 2 O ),

 

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