Question

In which zone of candle flame a partial combustion of wax vapours takes place

Answer 1

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The middle zone of the candle flame is moderately hot and is yellow in color, and partial combustion of fuel takes place. It is bright part of the fire. The innermost zone of the flame is the least hot and is black in color. This is due to the presence of unburnt wax vapors.
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Answer 2

The flame appears blue. It is the outermost zone of the flame. Luminous zone or the zone of incomplete combustion is moderately hot. The wax vapours do not burn completely as the supply of oxygen is inadequate.