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Question

Which of the following gases is used for welding
  1. methane
  2. Ethane
  3. Acetylene
  4. Ethene


Solution

The correct option is C Acetylene
2CHCH+5O24CO2+2H2O
       ΔH=1300 KJ
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.

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