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 :Ethyne is an unsaturated hydrocarbon. Combustion of ethyne in air produces a yellow flame with lot of black SMOKE. DUE to this incomplete combustion, heat produced is very less than the heat required for welding, hence, the mixture of ethyne and air is not used for welding. When the combustion of ethyne is carried out with oxygen, due to complete combustion heat produced is very LARGE which is usually NEEDED for welding, hence the mixture of ethyne and oxygen is used for welding. `2[CH-=CH]+5O_(2)to4CO_(2)+2H_(2)O+` Heat and Light