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Q.

Is it true that The hottest zone of the flame is the outermost zone?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is true.
The hottest zone of the flame is the outermost zone.
The flame of a candle has different zones. The innermost zone of the candle is the zone of unburnt wax vapours. It is the least hot by temperature and is black in colour. The middle zone is of partial combustion. It is moderately hot and is yellow in colour. The outermost zone is the zone of complete combustion. It is the hottest zone of the flame and is blue in colour.
  
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