Question

Name the classes of hydrides of which H20,B2H6 and NaH belong?

Answer 1

Hydrides are anion of Hydrogen. 

There are 5 types of hydrides as Ionic, Covalent, Metallic or interestitial, transition metal, and dueterides. 

In NaH, Hydrogen is bound to Na which is electropositive metal. NaH has strong ionic bond which is thus falls into 'Ionic Hydride'. 

In H2O, hydrogen is bound to non-metallic atom Oxygen. Hydrogen is bound to Oxygen by covalent bond by sharing an electron pair. Thus, H2O falls into 'Covalent Hydride