Q. 333.7( 7 Votes )

What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen? Compare their behaviour towards water.

Answer :

The elements of atomic numbers 15, 19, 23, and 44 are nitrogen, potassium, vanadium, and ruthenium respectively.

1) Hydride of nitrogen:


Hydride of nitrogen (NH3) is a covalent molecule. This hydride molecule contains excess of electrons and hence it is electron rich hydride molecule.



2) Hydride of potassium:


This hydride is ionic in nature because of the strong electropositive nature of potassium ion and hence it is crystalline in nature.


3) Hydrides of Vanadium and Ruthenium:


d and f-block elements form non-stoichiometric hydrides and vanadium and ruthenium also belong to the d-block of the periodic table. Hydrides of vanadium and ruthenium are therefore, metallic in nature having a deficiency of hydrogen.


4) Behaviour of hydrides towards water:


Potassium hydride reacts violently with water and the reaction is given as below:


KH + H2O KOH + H2


Ammonia (NH3) behaves as a Lewis base and the reaction of ammonia with water is given as below:


NH3 + H2O ß OH- + NH4+


Vanadium and ruthenium hydride do not react with water.


Hence, the increasing order of reactivity of the hydrides is:


(V, Ru) H < NH3< KH.


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