Give reason: A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.

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Solution

Hydrogen is explosive when mixed with air so burns with explosion near the mouth of gas jar but extinguished out inside the jar because the burning requires the presence of oxygen which in not present inside the jar.

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Similar questions

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

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