Ncert Exercises & Solutions

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?

Sodium reacts with dihydrogen to form sodium hydride which is a crystalline ionic solid.

2 Na + H_{2} \to 2 {Na}^{+} H^{-}

It reacts violently with water to produce H₂ gas

2 NaH + 2 H_{2} O \to 2 NaOH + 2 H_{2}

In solid state, NaH does not conduct electricity. On electrolysis, in its molten state gives H₂ at anode and Na at cathode.

{Na}^{+} H^{-} (l) \overset{Electrolysis}{\to} \underset{At catohde}{2 Na (l)} + \underset{At anode}{H_{2} (g)}

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