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Preparation of Hydrogen

Why Hydrogen ...

Question

Why Hydrogen although lighter than air, is not collected by the downwards displacement of air?

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Solution

Even though hydrogen is lighter than air it is not collected by downward displacement of air because of these reasons:
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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