Combustion of a Candle


 
 
Concept Explanation
 

Combustion of A Candle

If we observe a candle flame closely, we will notice the following:-

  • The wick burns and it stands in a pool of liquid wax.
  • There is a small portion of unburnt wick between the flame and the liquid wax.
  • The liquid wax is trapped in a cup of solid wax.
  • The liquid or solid wax never catches fire.
  • Conclusion:

    1. It is only the wax vapours that burn. Neither liquid wax nor solid wax burns.

    2. When a candle wick is lit, the heat produced from the flame melts the wax.

    3. The wick soaks or absorbs the molten wax.

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    Sample Questions
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    Question : 1

    The disadvantages of incomplete combustion is/are _____________________ .

    Right Option : D
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    Question : 2

    Which of the following statements are true?

    1 In the luminous zone of candle flame,vaporised wax gets oxidised to carbon dioxide which burns with a blue flame.

    2 There is no burning in the dark inner zone of the flame.

    3 Non luminous zone is the hottest part of the flame.

    4 Luminous zone of a flame is mainly due to incomplete burning of carbon.

    Right Option : C
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    Question : 3

    The heat produced by burning 1 gm of fuel completely is known as_____________________.

     

                               

    Right Option : B
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