When a burning candle is covered with a glass it extinguishes because:

supply of oxygen is cut off

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supply of hydrogen is cut off

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supply of nitrogen is cut off

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supply of

C O_{2}

is cut off

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Solution

The correct option is A supply of oxygen is cut off
This happens because oxygen in the air inside the glass tumbler is utilized in burning the candle. All the oxygen gets converted into carbon dioxide. Carbon dioxide does not support burning and hence candles stop burning.

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Explain why, when a burning candle is covered with an inverted gas jar, the candle gets extinguished after some time.

Give reasons :

(a) Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.

(b) A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.

(d) Apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame.

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