Give reasons for the following:
Though hydrogen is lighter than air, it cannot be collected by downward displacement of air.

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Solution

Since hydrogen is lighter than air, it is possible to collect the gas by downward displacement of air but it is not safe to do so since a mixture of hydrogen and air can lead to an explosion.

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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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