What will happen, if a lighted candle is brought near the mouth of a jar containing: 1.Hydrogen gas? 2.Carbon dioxide gas?

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Solution

Dear Student,..... (i). When a lighted candle is brought near the mouth of the jar containing hydrogen gas, a pop sound is heard and the flame of the candle is extinguished. (ii). When the lighted candle is brought near the mouth of a jar containing carbon dioxide gas the flame of the candle extinguish without making any sound. Regards.

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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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