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

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Solution

When we place a lighted wooden splinter to the mouth of the test tube. A ‘pop’ sound is heard which is caused due to spontaneous reaction of Hydrogen with atmospheric oxygen.

H₂ + O₂ ------> 2H₂O

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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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