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what are upward displacement of air, downward displacement of water and why are they not used to collect hydrogen
Asked by dvddivs...(student) , on 30/11/11

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 upward displacement of air - collection of a gas/liquid below air (i.e. by displacing air upwards)

downward displacement of water - collection of an immiscible liquid/gas above the surface of water (i.e. by displacing water downward)

Collection of hydrogen is not possible by upward displacement of air because hydrogen-air mixture is combustible. It is only possible by downward dispacement of water because hydrogen does not dissolve in water.

Posted by Ankit Pandey(student)on 1/12/11

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