Q. 76

Sodium forms a crystalline ionic solid with dihydrogen. The solid is non-volatile and non- conducting in nature. It reacts violently with water to produce dihydrogen gas. Write the formula of this compound and its reaction with water. What will happen on electrolysis of the melt of this solid?

Answer :

The ionic solid crystal which is formed is non-volatile and non- conducting in nature. It reacts violently with water to produce dihydrogen gas.


The formula of this compound is NaH and its reaction with water is given below


NaH (s) + H2O (aq) NaOH (aq) +H2 (g)


On electrolysis of the melt of this solid, following reaction will take place-


2H- (melt) H2 (g) + 2e-


The melt is able to conduct electricity and liberate Dihydrogen gas at anode on electrolysis.


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