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2014-07-26T23:04:39+05:30
Basically, if it is written in any chemical equation in word problem then air is taken as oxygen. Otherwise it is the mixture of many different gases. 
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2014-07-27T02:10:31+05:30

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Air does not have any chemical name specifically. When a reaction is done in presence of air, it probably means oxygen being used in the reaction comes from air. The pressure of air is used.

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