Please explain the solution with reason.

Dear Student,

The covalence character at maximum are determined by using the charge of the ion, higher the charge higher the covalence, among the given option 

FeCl2 = +2,  ZnCl2 = +1,   HgCl2 = +2,   CdCl2 = 0

The answer is Option (A) FeCl2 (Fe ion charge is denser than Hg)

Regards.

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