Among the following the correct statements are I. LiH , BeH _2 and MgH _2 are saline hydrides with significant covalent character II. Saline hydrides are volatile III. Electron - precise hydrides are Lewis bases IV. The formula for chromium hydride is CrH
C. I, IV only
Saline hydrides are not volatile as the strong ionic bonds keep the constituent ions together. Thus, statement II is incorrect. Electron-precise hydrides like CH _4, SiH _4, act as pH - neutral species. Thus, statement 3 is incorrect.
Related: Chemistry — Hydrogen · All PYQ Banks