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Prove that air is a mixture of gases and not a pure substance.

Because pure substance have one kind of particle but in air there are presence of dust particles ,oxygen ,nitrogen,water vapours etc .that's why air is the mixture not a pure substance
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the answer is as follows
As given in the air chart that 78% of Nitrogen and 21% of Oxygen and 1% of other gases present in air that only enough to prove that air is a mixture of gases and not a pure substance
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The air is a mixture of oxygen, carbondioxide, nitrogen, water, dust etc...
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Air is the mixture of gases as it contain 78% of nitrogen , 21% of oxygen 0.03% of carbon dioxide and many more gases
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