A mixture of oxygen and ethyne is burnt for welding. Why is a mixture of ethyne and air NOT used for

Q: What is the correct answer for CBSE10?

The correct answer is B. The 'QUESTIONS' section asks this. The combustion section explains that 'limiting the supply of air results in incomplete combustion... giving a sooty flame'. For welding, a very hot flame is needed, which requires complete combustion. Air contains only about 21% oxygen, which is insufficient for the high temperatures required for welding ethyne, leading to incomplete combustion and a cooler, soot

Q: A mixture of oxygen and ethyne is burnt for welding. Why is a mixture of ethyne and air NOT used for welding?

The correct answer is B. The 'QUESTIONS' section asks this. The combustion section explains that 'limiting the supply of air results in incomplete combustion... giving a sooty flame'. For welding, a very hot flame is needed, which requires complete combustion. Air contains only about 21% oxygen, which is insufficient for the high temperatures required for welding ethyne, leading to incomplete combustion and a cooler, soot

Q: What are the options for this CBSE10 question?

A. Air contains nitrogen, which interferes with the flame. · B. Air provides an insufficient supply of oxygen for complete combustion, leading to a lower temperature. · C. Ethyne is highly reactive with nitrogen in the air. · D. Oxygen is cheaper than air for industrial use.

Question

A mixture of oxygen and ethyne is burnt for welding. Why is a mixture of ethyne and air NOT used for welding?

FirstInTest · Accepted Answer

The 'QUESTIONS' section asks this. The combustion section explains that 'limiting the supply of air results in incomplete combustion... giving a sooty flame'. For welding, a very hot flame is needed, which requires complete combustion. Air contains only about 21% oxygen, which is insufficient for the high temperatures required for welding ethyne, leading to incomplete combustion and a cooler, sooty flame. Pure oxygen ensures complete combustion and a much hotter flame.

Answer

Air contains nitrogen, which interferes with the flame.

Answer

Air provides an insufficient supply of oxygen for complete combustion, leading to a lower temperature.

Answer

Ethyne is highly reactive with nitrogen in the air.

Answer

Oxygen is cheaper than air for industrial use.

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