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Question

Correct order of ionic character is:


A
CaH2<BaH2<CH4
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B
CH4<CaH2<BaH2
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C
CH4<BaH2<CaH2
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D
BaH2<CaH2<CH4
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Solution

The correct option is B $$CH_4 < CaH_2 < BaH_2$$
$$BeH_2 < CaH_2<BaH_2$$

Smaller the size of cation more will be its polarising power. Hence, $$BeH_2$$ will be the least iconic.
  "or"
On moving down the group metallic character of metals increases so the ionic character of metal hydride increases.

Hence option B is correct. 

Chemistry

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