A)
Zone Characteristic i Innermost Least hot and black ii Luminous Moderately hot and yellow
B)
Zone Characteristic i Outermost Hottest and black ii Luminous Least hot and blue
C)
Zone Characteristic i Non-luminous Least hot and blue ii Innermost Hottest and black
D)
Zone Characteristic i Non-luminous Moderately hot and yellow ii Outermost Least hot and black
Correct Answer: A
Solution :
The outermost zone of a candle flame is the hottest zone and is blue in colour. It is a non-luminous zone. The middle zone of a candle flame is moderately hot and yellow in colour. It is the luminous zone of a candle flame. The innermost zone contains unburnt carbon particles, which gives it a black colour. It is the least hot zone of a candle flame. The correct answer is A.
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