Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
$(b)$ Divalent atom

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Solution

Divalent elements are those which have valency equal to two.
Divalent atom, calcium reacts with hydrogen to form calcium hydride.
That is,

$C a + H_{2} \to C a H_{2}$

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

(a) a monovalent metal

(b) a divalent metal.

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give a reaction of hydrogen with monovalent and divalent metals.

give a reaction for hydrogen with a monovalent nd a divalent metal ?

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