The outermost region of a flame is the zone of complete combustion.

True

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False

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Solution

The correct option is A True
The zone of complete combustion is actually the non-luminous zone. It is the outermost and hottest region of the flame, where the combustion of wax-vapour takes place completely, thereby giving carbon dioxide and water vapour.
$C_{x} H_{y} (c a n d l e) + O_{2} \to C O_{2} (g) + H_{2} O (g)$

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