when heated in air produce a carbon monoxide b carbon dioxide C Nitrogen dioxide D oxygen
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Except for helium, which is mostly extracted from natural gas, oxygen, nitrogen and the other rare gases are extracted from the air that makes up Earth's atmosphere. Unlike the sources of some chemicals there are therefore no concerns about the depletion of this resource and if a sample of air is used to produce one of the gases, there are no problems about venting the 'waste gases' back into the atmosphere.
The ready availability of oxygen and its reactivity with many other elements means that it is used during the production of many other chemicals, whereas some of the uses of nitrogen and the rare gases depend on their inertness.
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