The hottest part of the flame lies in its _______________ zone?
Correct answer: A. Non-luminous
- A. Non-luminous
- B. Luminous
- C. Yellow
- D. Unburnt gases
Explanation
The outer non-luminous zone has sufficient oxygen for nearly complete combustion, so it reaches the highest temperature. The luminous or yellow zone contains glowing soot and is generally cooler.
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