Answer:
When ethyne is burnt in oxygen, large quantity of heat along with light is produced. The heat evolved
can be used for gas welding which usually carried to weld small broken pieces of articles made up of
iron.
heat and light
Air mainly contains a mixture of nitrogen (4 parts) and oxygen (1 part). As we known, nitrogen gas does not support combustion. This means that in air, only oxygen will help in the combustion of ethyne. Therefore, it is always better to use oxygen for the combustion of ethyne.
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