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Which part of the flame is the hottest?

  • A.Blue zone
  • B.Luminous zone
  • C.Dark zone
  • D.Yellow zone

Answer: A

The blue zone is the hottest part of the flame.

There the air supply is plentiful and combustion is complete, so the temperature reaches about 1,500 °C. The luminous yellow region is cooler, its light coming from glowing unburnt carbon, and the innermost dark zone is unburnt gas and coldest of all.

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