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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 CH4<CaH2<BaH2
BeH2<CaH2<BaH2

Smaller the size of cation more will be its polarising power. Hence, BeH2 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.

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