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

A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar because
Hydrogen is a combustible gas but a non-supporter of combustion.
It burns itself but does not allow the substance to burn in it.

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(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.

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

What will happen to a lighted candle if it is brought near the mouth of a jar containing hydrogen gas?

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