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give a reacti...

Question

give a reaction of hydrogen with monovalent and divalent metals.

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Solution

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

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

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