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NEET levelSingle correct optionDifficulty 1 of 3sb042

Which s-block hydride is covalent and polymeric in nature?

A $CaH X_{2}$
B $BeH X_{2}$
C $NaH$
D $LiH$

Answer: B

Be

is small and polarising, so

BeH X_{2}

is a covalent polymeric solid with hydrogen bridges. The hydrides of Li, Na and Ca are ionic.

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