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Question

Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with :

(a) a monovalent metal

(b) a divalent metal.


Solution

Reaction of hydrogen with metals gives metal hydrides.
Group-1 alkali metals are monovalent metals.
reaction : 2M + H2 → 2MH
where M = Li, Na, K etc

Group-2 alkaline earth metals are divalent metals.
reaction: M + H2 → MH2
where M = Be, Mg, Ca etc
 

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