If a lit candle is covered with a glass tumbler, the flame gets extinguished after some time. What is the reason for this?

Correct option is B

​The correct answer is (B) Due to limited oxygen the covered candle got extinguished after some time.

• When a candle is lit, it burns because of a chemical reaction between the wax (fuel) and oxygen in the air. The flame requires a continuous supply of oxygen to maintain the combustion process.
• When the candle is covered with a glass tumbler, the oxygen supply inside the tumbler becomes limited. As the candle continues to burn, the oxygen inside the glass is gradually consumed, and the production of carbon dioxide increases.
• Once the oxygen level becomes too low to sustain combustion, the flame goes out.

Explanation of Other Options:

• Due to limited nitrogen: Nitrogen makes up about 78% of the air, and it does not support combustion. The reason for the flame going out is not due to the limited nitrogen but the lack of oxygen.
• Due to limited sulphur: Sulphur is not required for the burning of a candle. The fuel for the candle is primarily wax, which is composed of hydrocarbons, not sulphur.
• Due to limited carbon dioxide: While carbon dioxide is a product of combustion, it is not a factor in the flame going out. The flame is extinguished due to the depletion of oxygen, not due to carbon dioxide.