Question

dark inner zone of a candle flame the coolest part of candle flame.. gv reasons

Answer 1

This is because the inner zone of candle flame undergoes incomplete combustion. Not all the carbon reacts with the oxygen there so the heat output is less. And that's why the innermost zone of the candle flame is not hot as the other zones...

*done*

Answer 2

Answer:

The temperaturesin this zones is not sufficient to ignite the wax. This region of the candle has the lowest temperate and the candle flame undergoes because of incomplete combustion.