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Question

The correct order of ionic character is:
  1. BeCl2<MgCl2<CaCl2<BaCl2
  2. MgCl2<BeCl2<BaCl2<CaCl2
  3. BeCl2<BaCl2<MgCl2<CaCl2
  4. BaCl2<CaCl2<MgCl2<BeCl2


Solution

The correct option is A BeCl2<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). 

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