Give reasons:
Apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame.

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Solution

Apparatus for laboratory preparation of hydrogen should be airtight so that hydrogen cannot mix with air to form an explosive mixture.

As the mixture of air and hydrogen is highly explosive, it should be kept away from the naked flame because when it meets fire, it burns violently.

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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.

For the laboratory preparation of hydrogen, give a method of collection.

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