Hydrogen is collected by the _ displacement of _ .

Downward; water

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Upward; water

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Upward; air downward; air

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Solution

The correct option is A
Downward; water

Hydrogen is collected by the downward displacement of water. This is because, hydrogen is virtually insoluble in water. It forms an explosive mixture with air and therefore it cannot be collected by downward displacement of air, even though it is lighter than the air.

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"Downward displacement of air" is a method of

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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