In the _____, the wax vapours coming from the candle do not burn at all due to the absence of oxygen.

Options

A. Dark zone
B. Blue zone
C. Innermost zone
D. Outer zone

Answer

**Step-by-Step Solution:**

1. **Understanding Combustion**: Combustion is a chemical reaction that occurs when a substance (usually a fuel) reacts with oxygen, producing heat and light. For combustion to take place, oxygen is essential.

2. **Identifying the Candle Structure**: A candle consists of wax (the fuel) and a wick. When the wick is lit, the heat melts the wax, and the wax vapors rise and mix with oxygen in the air to burn, producing light and heat.

3. **Recognizing the Zones of a Flame**: A flame has different zones, including the outer zone (where combustion occurs) and the inner zone (where combustion is incomplete).

4. **Defining the Dark Zone**: The dark zone is the part of the flame that is closest to the wick. In this zone, there is insufficient oxygen for combustion to occur.

5. **Conclusion**: In the dark zone of the candle flame, the wax vapors do not burn at all due to the absence of oxygen.

**Final Answer**: In the **dark zone**, the wax vapours coming from the candle do not burn at all due to the absence of oxygen.

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