Partial combustion takes place in the middle region of a candle flame. The temperature of this region is ________.

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Solution

$∙$ Outer region of the flame undergoes complete combustion. So, this is the hottest part of the flame.
$∙$ Middle region undergoes partial combustion. So, this zone is moderately hot.
$∙$ Inner region is the innermost part of the flame with unburnt wax vapours. So, the temperature of the flame in this zone is the least.
$∙$ Hence, the temperature of middleregion is higher than the inner region and lower than the outer region.

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