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Polymeric covalent hydride and most ionic hydride of group 2 metals are

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BaH₂, BeH₂

MgH₂, BeH₂

CaH₂, BaH₂

BeH₂, BaH₂

answer is B.

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Detailed Solution

Barium is large sized and hence forms cation readily to form ionic bond with H.

Beryllium is small sized and electron deficient. Hence, forms covalent hydride, which is polymeric.

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