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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+5O_(2)to4CO_(2)+2H_(2)O+`Heat
When ethyne is burnt in air ,it gives a sooty flame. This is due to incomplete combustion caused by limited supply of air .However ,if ethyne is burnt with oxygen ,it gives a clean flame with temperature `3000""^(@)C` because of complete combustion .This oxy -acetylene flame is used for welding .It is not possible to attain such a high temperature without mixing oxygen .This is the reason why a mixture of ethyne and air is not used.
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