A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?

Explanation

**Step-by-Step Solution:**

1. **Understanding Combustion**: When ethyne (C₂H₂) is burned, it reacts with oxygen to produce heat and light. This process is known as combustion.

2. **Types of Combustion**: There are two types of combustion:
- **Complete Combustion**: This occurs when there is a sufficient supply of oxygen, resulting in the complete conversion of ethyne to carbon dioxide (CO₂) and water (H₂O). This type of combustion produces a clean flame.
- **Incomplete Combustion**: This occurs when there is a limited supply of oxygen, leading to the formation of carbon monoxide (CO) and soot (carbon particles). This type of combustion produces a sooty flame.

...