Question

Which of the following gases is used for welding.

• A. Methane
• B. Ethane
• C. Acetylene
• D. Ethene

Answer 1

Answer: (C)

Acetylene

Answer 2

$2 ⥂ CH \equiv CH + 5O_{2} \rightarrow 4CO_{2} + 2H_{2}O\Delta H = - 1300KJ$

The combustion of acetylene is highly exothermic and the heat produced during the combustion can be used for welding purposes in the form of oxy acetylene flame.