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

Explanation

Sodium reacts with dihydrogen to form sodium hydride which is a crystalline ionic solid.
`2Na + H_2 to 2NaH ` or `2Na^(+) H^(-)`
It reacts with water to produce `H_2 ` gas
`2NaH + H_2 to 2NaOH + H_2 (g)`
Although `Na^(+)H^(-)` does not conduct electricity in the solid state, but electrolysis of its melt give `H_2` gas at anode and Na at cathode.
`2Na^(+) H^(-) overset("Electrolysis")to underset("At cathode")(2Na(l)) + underset("At anode")(H_2 (g))`