Discussion
The hottest part of the gas flame is known as
Answer: D
The hottest part of a gas flame is the non-luminous zone.
Where the air supply is plentiful, combustion is complete and the flame burns pale blue at about 1,500 °C. The luminous yellow zone owes its light to glowing unburnt carbon particles and is cooler, because combustion there is incomplete; the dark inner zone is unburnt gas and coldest of all.
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