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Q.

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

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a

BaH2, BeH2
 

b

BeH2, BaH2
 

c

MgH2, BeH2
 

d

CaH2, BaH2

answer is B.

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Detailed Solution

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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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