Q14 / 160 · TS EAMCET 2022 (19 Jul Shift 2) · Chemistry

The correct statements among the following are. (A) $\mathrm{BeH}_2$ and $\mathrm{MgH}_2$ are polymeric in nature. (B) $\mathrm{LiH}$ is unreactive to oxygen, at moderate temperatures. (C) $\mathrm{BeH}_2$ and $\mathrm{MgH}_2$ possesses significant covalent character. (D) the stability of alkali hydrides follows the order $\mathrm{LiH} < \mathrm{NaH} < \mathrm{KH} < \mathrm{RbH} < \mathrm{CsH}$.

  • A
    A, B, C, D
  • B
    A, C only
  • C
    A, C, D only
  • Correct answer
    D
    A, B, C only

Solution

(a) Due to covalent bonding, $\mathrm{Be}$ and $\mathrm{Mg}$ form bridge bonding or polymeric structure. (b) $\mathrm{LiH}$ is unreactive towards oxygen and chlorine at moderate temperature.

Hence, the correct answer is option: 'D'.

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