When a burning candle is covered with an inverted lid, the flame goes off after some time. This is because of:
A
the absence of carbon dioxide.
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B
the absence of oxygen.
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C
the absence of carbon monoxide.
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D
the absence of water vapours.
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Solution
The correct option is B the absence of oxygen. Adequate supply of oxygen plays a very important role in the burning of a candle. Covering the candle with a lid cuts the supply of oxygen. As a result, the candle flame goes off.