Multiple choice

Riya was conducting an experiment and she lit two candles on a table. Then she covered one of the candles with a tall glass. After sometime the candle covered with the glass stopped burning and the other candle continued to burn.

Which of the following reasons will best explain why the covered candle blew out?

  1. Presence of carbon dioxide when the candle is covered.

  2. Presence of nitrogen when the candle is covered.

  3. Absence of carbon dioxide when the candle is covered.

  4. Absence of oxygen when the candle is covered.

  5. Both options 2 and 4.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Correct. Absence of oxygen in the air for the covered candle caused it to blow out. Burning can occur only in thepresence of oxygen and when most of this oxygen is used up by the burning candle, it can no longer burn and blows out.

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