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B
MgCl2<BeCl2<BaCl2<CaCl2
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C
BeCl2<BaCl2<MgCl2<CaCl2
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D
BaCl2<CaCl2<MgCl2<BeCl2
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Solution
The correct option is ABeCl2<MgCl2<CaCl2<BaCl2 According to Fajans' rule, as the size of the cation decreases, the covalent character increases. The ionic character follows the order suggested by option (a).