why s hydrogen gas collected by downward displacement of water?
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Hydrogen is collected by downward displacement of water as it is less denser than water. Hence it comes out at the surface of water . It is insoluble in water so it does not dissolve in water. ... So, it is impossible to collect hydrogen gas in air medium.
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Explanation:
hydrogen is collected by downward displacement of water in lab because if its collected by upward displacement it will come in contact with air in surrounding and and will flow away in free state.
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