Question

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

• A. lower than inner region
• B. higher than inner region
• C. lower than outer region
• D. higher than outer region

Answer 1

Answer: (B), (C)

lower than outer region

$\bullet$ Outer region of the flame undergoes complete combustion. So, this is the hottest part of the flame.
$\bullet$ Middle region undergoes partial combustion. So, this zone is moderately hot.
$\bullet$ 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.
$\bullet$ Hence, the temperature of middleregion is higher than the inner region and lower than the outer region.