Flames


 
 
Concept Explanation
 

Flames

Flame: A flame is the region where combustion (or burning) of gaseous substances takes place. Depending upon the amount of oxygen available and burning of fuels, flames are of the following two types:

  • Blue or non - luminous Flame: When the oxygen supply is sufficient, the fuels burn completely producing a blue flame and no light is produced. E.g. burning of LPG in gas stove.
  • Yellow or Luminous Flame: In the insufficient supply of air, the fuels burn incompletely and produce yellow flame because of the presence of unburnt carbon particles, e.g. burning of wax vapours.
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    Sample Questions
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    Question : 1

    Which of the following are correct :

    (a) Some solid and liquid fuels like coal and charcoal do not vaporize on heating.

    (b) Burning of LPG in gas stove produce blue or non-luminous Flame.

    Right Option : C
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    Question : 2

    When the oxygen supply is sufficient, the fuels burn completely producing a ___________________ and no light is produced.

    Right Option : A
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    Explanation
    Question : 3

    A flame is the region where combustion (or burning) of _______________________ substances takes place.

    Right Option : C
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