Why hydrogen is collected by downward displacement of water ? Give five reasons?

Hi,
There are mainly two reasons because of which hydrogen can be collected by the downward displacement of water.
·  Firstly,hydrogen has a lower density than water and hence rises to the surface.
·  Secondly,hydrogen is not very soluble in water.
Hope this helps.
Cheers!

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  this is because hydrogen is lighter than water,and if it is collected over air it can form an explosive mixture,it is slightly soluble in water.

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my answer also _hydrogen is lighter than water

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 mine too...your

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