Question

a mixture of ethyne and oxygen is burnt for welding. in your opinion why can 't we use a mixture of ethyne and air for this purpose?

Answer 1

air consist of diffrnt gases which may due to combustion form diffrnt products.
nd it does not support combustion,so we use oxygen.

Answer 2

Answer:

BTS

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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.