Question

Give reason
Hydrogen although lighter than air is not collected by downward displacement of air.​

Answer 1

Answer:

Hydrogen gets oxidised when it is exposed to oxygen which makes it burn with a pale blue flame and the residue is water. This means that it mixes with oxygen. Downward displacement of air requires a gas that does not mix with air and is lighter than air. Hydrogen is lighter than air but mixes with air.

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Answer 2

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Hydrogen  can get oxidised while it is exposed to oxygen which makes it to burn with a blue flame and the upcoming residue is as water. This means that it mixes with the oxygen.