The correct statements among the following are
(A) $\mathrm{BeH}_2$ and $\mathrm{MgH}_2$ are polymeric in nature.
(B) 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 $\mathrm{LiH}<\mathrm{NaH}< \mathrm{KH}<\mathrm{RbH}<\mathrm{CsH}$.
The correct order of melting points of the following salts is
$$ \begin{array}{lll} \text { LiCl } & \text { LiF } & \text { Lil } \\ \text { I } & \text { II } & \text { III } \end{array} $$
$\mathrm{Al}+$ aq. NaOH (excess) $\longrightarrow P+Q \cdot P$ and $Q$ are
Among the following elements, $X$ exhibits maximum catenation and $Y$ is the least abundant on earth. $X$ and $Y$ elements are
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