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A mixture of oxygen and ethyne is burnt ...

A mixture of oxygen and ethyne is burnt for welding . Can you tell why a mixture of ethyne and air is not used ?

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`2HC-=CH+SO_(2)to4CO_(2)+2H_(2)O`+ Heat
When ethayne is burnt in air,it gives a sooty flame .This is due to incomplete combusition caused by limited supply of air.However if ethyne is burnt with oxygen,it gives a clean flame with temprature `3000^(@)c` because of complete combusition.This acetylene flame is used for welding.It is not possible to attain such a high temprature without mixing oxygen.This is the reason why a mixture of ethyne and air is not used.
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