Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.
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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
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Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass.
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