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
• B. Water vapours
• C. Carbon dioxide
• D. Wax

Answer 1

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.