Why is that during laboratory preparation of hydrogen gas, it is collected downward displacement of water??

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Solution

Dear Abhishek Because hydrogen gas is lighter than air it is collected by downward displacement of water

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Why during laboratory preparation of hydrogen it is collected by downward displacement

During laboratory preparation of oxygen by hydrogen peroxide and potassium chlorate, the gas is collected by _____ displacement of water.

Why is granulated zinc used in laboratory preparation of hydrogen and why is hydrogen collected by downward displacement of water?

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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