Among the following the correct statements are I. $\mathrm{LiH}, \mathrm{BeH}_2$ and $\mathrm{MgH}_2$ are…

Among the following the correct statements are I. $\mathrm{LiH}, \mathrm{BeH}_2$ and $\mathrm{MgH}_2$ 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 $\mathrm{CrH}$ The correct option is
  1. I, III only
  2. II, IV only
  3. I, IV only
  4. III, IV only

Solution

Saline hydrides are not volatile as the strong ionic bonds keep the constituent ions together. Thus, statement II is in correct. Electron-precise hydrides like $\mathrm{CH}_4, \mathrm{SiH}_4$, act as $\mathrm{pH}$ - neutral species. Thus, statement III is incorrect.

Asked in: AP EAMCET 2023 (16 May Shift 1)

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