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

1. BeH₂
2. CaH₂
3. BaH₂
4. None of these

Correct answer: BeH₂

Solution

The polarising power of a cation is inversely proportional to its size. Since Be²⁺ is the smallest cation among Be²⁺, Ca²⁺, and Ba²⁺, it has the highest polarising power, making BeH₂ the least ionic.

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