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

A mixture of oxygen and ethyne is burnt for welding . Can you tell why

1.	A mixture of oxygen and ethyne is burnt for welding . Can you tell why a mixture of ethyne and air is not used ?
Answer» Solution :`2HC-=CH+SO_(2)to4CO_(2)+2H_(2)O`+ HEAT When ethayne is burnt in air,it gives a sooty FLAME .Thisis due toincomplete 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.