Discussion
Which of the following statements about zones of a candle flame is not true?
Answer: B
The statement that is not true is The temperature of middle zone and the non-luminous part of the flame is same.
A candle flame has three zones. The outermost non-luminous (blue) zone has the most air, so combustion there is complete and it is the hottest part. The middle luminous (yellow) zone has partial combustion and is moderately hot; unburnt carbon particles glow and give the light. The innermost dark zone around the wick holds unburnt wax vapour and is the least hot.
So the middle zone is cooler than the outer zone, and the two temperatures are not the same. Statements A, C and D describe the zones correctly.
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