Hydrogen although lighter than air , is not collected by the down ward displacement of air . Give reason
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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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