The outermost zone of a candle flame is the:

1. least hot part
2. coldest part
3. hottest part
4. moderately hot part

Correct Answer: C. hottest part

Explanation: In the outer zone, complete combustion of the fuel takes place and the colour of the flame is blue. Hence, it is the hottest part of the flame. 

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Updated on: 10-Oct-2022

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