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.

Difficulty: Easy

Luminous zone
Dark zone
Blue zone
Non-luminous zone

Correct Answer: Blue zone

Explanation:

Concept/Approach
With adequate air supply, a Bunsen flame is blue and non-luminous. The outer blue (non-luminous) zone is the hottest due to complete combustion.

Note
Some texts say “non-luminous outer zone” as the hottest; in a practical gas flame this is the blue zone.

Final Answer
Blue zone

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