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Among $CaH_2$, $BeH_2$, $BaH_2$, the order of ionic character is
Explanation
Ionic character of group 2 hydrides increases down the group.
Detailed Solution
For group 2 hydrides, on moving down the group the metallic character of the metals increases, so the ionic character of the metal hydride increases.
So the order is $BeH_2 < CaH_2 < BaH_2$.