Flames of the mixture .......... are used for welding.

Options

A. oxyhydrogen
B. oxynitrogen
C. oxycarbon
D. oxymethane

Explanation

**Step-by-step Solution:**

1. **Understanding the Question**: The question asks about the type of flame that is used for welding. It specifies a mixture that produces this flame.

2. **Identifying the Mixture**: The flame used for welding is typically produced by a combination of gases. The most common mixture used for welding is a combination of hydrogen and oxygen.

3. **Naming the Mixture**: The mixture of hydrogen (H2) and oxygen (O2) is known as "oxyhydrogen." This mixture is highly flammable and produces a high-temperature flame when ignited.

4. **Historical Context**: Oxyhydrogen was the first gaseous mixture used for welding purposes, making it significant in the field of welding technology.

5. **Final Answer**: Therefore, the complete answer to the question is: "Flames of the mixture **oxyhydrogen** are used for welding."

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