Among CaH2, BeH2, BaH2, the order of ionic character is
(1) BeH2 < CaH2 < BaH2
(2) CaH2 < BeH2 < BaH2
(3) BeH2 < BaH2 < CaH2
(4) BaH2 < BeH2 < CaH2

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1 Answers

BeH2 < CaH2 < BaH2
Smaller the size of cation, more will be its polarising power.  Hence BeH2 will be least ionic.

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