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Question

On placing an inverted tumbler over a burning candle, the flame extinguishes after some time. This is because of the non-availability of


A

Oxygen

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B

Water vapours

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C

Carbon dioxide

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D

Wax

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Solution

The correct option is A

Oxygen


The explanation for Correct answer:

Option A Oxygen

  • The flame extinguishes after some time on placing an inverted tumbler over a burning candle due to the non-availability of oxygen.
  • The chemical process in which a substance reacts rapidly with oxygen and gives off heat.
  • In combustion reactions, fuel is heated up and it reacts with oxygen. Oxygen is essential for burning.
  • During the process of combustion, atmospheric oxygen combines with carbon to produce carbon dioxide and hydrogen to produce water.
  • However, too much oxygen causes uncontrolled burning and explosions, such that even tiny sparkles can set a massive outbreak of fire.
  • On placing an inverted tumbler over a burning candle, the flame extinguishes after some time because oxygen in the air inside the glass tumbler is utilized in burning the candle.
  • All the oxygen inside the glass tumbler gets converted into carbon dioxide.
  • Carbon dioxide does not support burning and hence candles stop burning.
  • Therefore, Option A is correct.

The explanation for Incorrect answer:

Option B Water vapours

  • The presence of water vapour does not support burning.
  • Hence option B is incorrect.

Option C Carbon dioxide

  • The presence of Carbon dioxide does not support burning.
  • Hence option C is incorrect.

Option D Wax

  • The presence of wax does not support burning.
  • Hence option D is incorrect.

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