Question

Pbcl 2 is ionic and pcl3 is covalent why?

Answer 1

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The charge on Pb in PbCl2 is +2 and PbCl4 is +4. According to Fajan's rule, greater the charge on the cation, more is its ability to polarize the bonding electrons towards itself giving the compound a higher covalent character. PbCl has a greater charge and hence is covalent.