name a metal which floats on the surface of cold water and reacts with it to form hydrogen gas.
name a metal which sinks in cold water and reacts with it to form hydrogen gas.
name a metal which is used as reactanct in the laboratory preparation of hydrogen gas.

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Answers

2015-10-03T11:03:12+05:30
The metal used as reactant in labrotary preparation of hydrogen gas is ZINC :)
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2015-10-03T18:42:29+05:30
Sodium reacts with cold water violently to form sodium hydroxide along with hydrogen gas.
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