Chapter 4: Carbon and Its Compounds

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Q
Carbon and Its Compound

Question:

A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?

Answer:

When ethyne is burned in air, it undergoes incomplete combustion to form a sooty flame. However, it gives a clean flame when burnt with oxygen because of the complete combustion of ethyne.

{color{Blue} oldsymbol{	extit{}2C_{ 2 }{ H }_{ 2 }(g)+5{ O }_{ 2 }(g)xrightarrow [ Delta ]{ { 3000 }^{ o }C } 4CO_{ 2 }(g)+2{ H }_{ 2 }O(l)}}

This flame is achieved at 3000โฐC and it is impossible to attain such temperature in absence of oxygen. Thus, a mixture of ethyne and air is not used.


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