Question

Ionic hydrides are formed by:

• A. transition metals
• B. elements of very high electropositivity
• C. elements of very low electropositivity
• D. metalloids

Answer 1

The correct option is B elements of very high electropositivity

Ionic hydrides are formed by metals that are electropositive with respect to hydrogen i.e., alkali and alkaline earth $($except $Be$ and $Mg)$. They involve an electron transfer from metal to $H$ forming hydride ion $H^{-}$.