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Question

The hottest part of a candle flame is the __________.

A
luminous zone
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B
dark zone
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C
hot zone
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D
non-luminous zone
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Solution

The correct option is D non-luminous zone
The Non-Luminous zone is the region of the complete combustion. If you look at a candle flame closely. You will see an "aura" formed around the candle. Since this zone is complete combustion and it is the hottest part of the flame.

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