Which of the following gases is used for welding

methane

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Ethane

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Acetylene

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Ethene

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Solution

The correct option is C Acetylene
$2 C H \equiv C H + 5 O_{2} \to 4 C O_{2} + 2 H_{2} O$
$Δ H = - 1300 K J$
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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