Dark zone is also called zone of _______.

Options

A. complete combustion
B. partial combustion
C. high combustion
D. no combustion

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Dark Zone":** The term "dark zone" is often used in the context of combustion and flames. It refers to a specific area within a flame.

2. **Identifying the Alternative Name:** The dark zone is known for its lack of combustion due to insufficient oxygen supply. This leads to the alternative name for the dark zone.

3. **Recognizing the Alternative Name:** The dark zone is also referred to as the "zone of death." This name reflects the absence of combustion and the conditions present in this area.

4. **Conclusion:** Therefore, the dark zone is also called the "zone of death."

**Final Answer:** Dark zone is also called zone of **death**.

---