Question

Draw the electron-dot structure for ethyne. A mixture of ethyne and oxygen is burnt for welding. In your opinion, why cannot we use a mixture of ethyne and air for this purpose?(All India - 2015)

Answer 1

Ethane forms an explosive mixture with air. Hence it is not used

Answer 2

Reaction of ethyne with oxygen and air

• For the electron-dot-structure of ethyne, kindly refer the given attachment.

Reaction of ethyne with oxygen:

• When ethyne is made to react with oxygen it leads to the formation of carbon dioxide and water as the product.
• The obtained product is collectively called as oxy-acetylene flame and supports welding due to high temperature.
• The chemical equation involved in the reaction as follows:

$2C_2H_2+7O_2\rightarrow4CO_2+6H_2O$

Reaction of ethyne with air:

• The reaction between ethyne and air is called incomplete combustion because in the presence of air ethyne is not completely burnt.
• Due to this, the reaction produces a flame of very low temperature which is not suitable for welding.
• Hence due to incomplete combustion of ethyne in the presence of air, this mixture cannot be used for welding purposes.

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