Write a note about saline (or) ionic hydride.

Explanation

Ionic hydrides composed of an electropositive metal, generally, an alkali or alkaline-earth metal (except beryllium and magnesium) formed by transferring of electrons from metal to hydrogen atoms. They can be prepared by the reaction of elements at about 400°C. These are salt-like, high-melting, white, crystalline solids having hydride ions (H) and metal cations `(M^(n+))`.
`2Li_((s))+H_(2(g))to2LiH_((s))`(Lithium hydride)
`2Ca_((s))+H_(2(g))to2caH_(2(s))` (Calcium hydride)