Which of the following gases is used for the welding

Options

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

Explanation

To determine which gas is used for welding, we can analyze the options provided in the question.

1. **Identify the gases mentioned**: The gases mentioned in the transcript are Methane (CH4), Acetylene (C2H2), and Ethene (C2H4).

2. **Understand the properties of each gas**:
- **Methane (CH4)**: This is a simple alkane and is not typically used for welding. It is a saturated hydrocarbon and does not produce the high temperatures needed for welding.
- **Acetylene (C2H2)**: This is an alkyne and is widely used in welding due to its ability to produce a very hot flame when burned with oxygen. It is the most common gas used in oxy-acetylene welding.
- **Ethene (C2H4)**: This is an alkene and is also not used for welding. Like methane, it does not produce the necessary temperatures for effective welding.

3. **Conclusion**: Based on the analysis, Acetylene (C2H2) is the gas that is used for welding.

**Final Answer**: Acetylene (C2H2) is the gas used for welding.

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