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Question

The correct order of increasing ionic character is:

A
BeCl2<MgCl2<CaCl2<BaCl2
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B
BeCl2<CaCl2<MgCl2<BaCl2
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C
BaCl2<CaCl2<MgCl2<BeCl2
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D
MgCl2<CaCl2<BeCl2<BaCl2
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Solution

The correct option is A BeCl2<MgCl2<CaCl2<BaCl2
As we move down the group, size increases and electronegativity decreases so ionic character increases.
Polarising power of Be2+>Mg2+>Ca2+>Ba2+Thus, ionic nature of BeCl2<MgCl2<CaCl2<BaCl2

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