Question

Unburnt carbon particles are present in the

• A. blue zone
• B. dark inner zone
• C. luminous zone
• D. non-luminous zone

Answer 1

The correct option is C

luminous zone

Explanation for the correct option-

Option (C)

1. The circular dark ring is formed on the slide by deposition of unburnt carbon particles present in the luminous zone of the candle.
2. Luminous zone is the brightest and is called the middle zone of a flame.
3. So, unburnt carbon particle is present in the luminous zone.

Explanation for the incorrect options-

1. Option (A) Blue zone- It is the outermost zone of the flame. It is also the hottest part of the flame.
2. Option (B) Dark inner zone- It is the coldest zone of the flame.
3. Option (D) Non-luminous zone- In this zone complete combustion occurs due to the availability of oxygen.

Hence, option (C) is the correct answer.