A mixture of ethyne and oxygen is used for welding. Why do you think a mixture of ethyne and air is not used?
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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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When ethyne is burnt in the presence of air, it does not give the desired performance due to the insufficiency of the production of heat. This is because in the mixture of air the amount of oxygen present by volume is 21% only. But when ethyne is burnt in the presence of gen it gives the best performance giving rise to temperature up to 3000°C. That's why a mixture of ethyne and air not used.
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