Flames (Bunsen/gas): The hottest part of a gas flame is known as which zone? Consider a properly adjusted Bunsen burner flame. Choose the correct zone.
IIT JEE
Chemistry
Difficulty: Easy
Choose an option
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ALuminous zone
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BDark zone
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CBlue zone
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DNon-luminous zone
Answer
Correct Answer: Blue zone
Explanation
Concept/ApproachWith adequate air supply, a Bunsen flame is blue and non-luminous. The outer blue (non-luminous) zone is the hottest due to complete combustion.
NoteSome texts say “non-luminous outer zone” as the hottest; in a practical gas flame this is the blue zone.
Final AnswerBlue zone