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(D) $BeH_2$ and $MgH_2$ are electron-deficient compounds and exist as polymeric structures in the solid state. This statement is correct.$(B)$ $LiH$ i

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$A, B, C$ only

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(D) $BeH_2$ and $MgH_2$ are electron-deficient compounds and exist as polymeric structures in the solid state. This statement is correct.$(B)$ $LiH$ is unreactive to oxygen at moderate temperatures, whereas it reacts at higher temperatures. This statement is correct.$(C)$ Due to the small size and high polarizing power of $Be^{2+}$ and $Mg^{2+}$ ions, $BeH_2$ and $MgH_2$ possess significant covalent character. This statement is correct.$(D)$ The stability of alkali metal hydrides decreases as the size of the alkali metal cation increases down the group. Therefore, the correct order is $LiH > NaH > KH > RbH > CsH$. This statement is incorrect.Thus, the correct statements are $(A)$, $(B)$, and $(C)$.

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