Which of the following statement is correct with respect to flame?

Question

Accepted Answer

Option 1 is correct because the outer zone of a flame is indeed its hottest part where complete combustion occurs. In a typical flame, such as that of a Bunsen burner, the outermost layer is exposed to the most oxygen, allowing for complete combustion of the fuel. This results in a higher temperature compared to other parts of the flame. The complete combustion in this zone produces a blue flame, which is an indicator of high temperature and efficient burning.

Now, let's examine why the other options are incorrect:

Option 2: The middle zone of the flame is not red-colored. In fact, the middle zone is typically yellow or orange due to incomplete combustion. This part of the flame is cooler than the outer zone and contains unburnt carbon particles that glow, giving it a yellowish color.

Option 3: The innermost zone of the flame is not moderately hot; it is actually the coolest part of the flame. This zone is where the fuel is initially heated and begins to vaporize, but there is insufficient oxygen for combustion to occur. As a result, it is cooler compared to the other zones.

Option 4: The innermost zone of the flame is not blue-colored. The blue color is characteristic of the outer zone where complete combustion takes place. The innermost zone is typically less visible and not blue because it lacks the conditions necessary for complete combustion.

In summary, Option 1 is correct because it accurately describes the outer zone of the flame as the hottest part where complete combustion occurs, while the other options incorrectly describe the characteristics of the different zones of a flame.