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Among CaH2, BeH2, BaH2, the order of ionic character is

1. BeH2 < CaH2 < BaH2
2. CaH2 < BeH2 < BaH2
3. BaH2 < BeH2 < CaH2
4. BeH2 < BaH2 < CaH2

Correct answer: BeH2 < CaH2 < BaH2

Solution

The ionic character of metal hydrides increases with the size of the metal cation. Since Ba > Ca > Be in size, the order of ionic character is BeH2 < CaH2 < BaH2.

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