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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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If a mixture of oxygen and ethyne is burnt, then ethyne burns completely producing a blue flame. The oxygen-ethyne flame is extremely hot and produces a very high temperature which is used for welding metals. A mixture of ethyne and air is not used for welding because burning of ethyne in air produces a sooty flame due to incomplete combustion, which is not hot enough to melt metals for welding.
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