Question

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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Answer 1

When ethyne is burnt in air, it gives a sooty flame. This is due to incomplete combustion caused by limited supply of air. Howevegr, if ethyne is burnt with oxygen, it gives a clean flame with temperature 3000°C because of complete combustion.

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Answer 2

Answer:

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When a mixture of oxygen and ethyne is burnt, it burns completely producing a blue flame. This blue flame is extremely hot which produced a very high temperature which is used for welding metals. But the mixture of ethyne and air is not used for welding purposes because burning of ethyne in air produces a sooty flame, which is not enough to melt metals for welding.