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4. Carbon and its Compounds
medium
A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used ?
Option A
Option B
Option C
Option D
Solution
$2HC \equiv CH + 5{O_2}\, \to \,4C{O_2} + 2{H_2}O$ $+$ Heat
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 $3000\,^oC$ 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.
Standard 10
Science
