Chemistry - Complete P-block Question with Solution | TestHub

As anion is same, the covalent character in ionic compound will depend upon the size and charge on the cation. According to fajan's rule,
Covalent nature ∝ charge on cation
$\text{PbO}$is most ionic as it has$\mathrm{P}{\mathrm{b}}^{2+}$and$\mathrm{M}{\mathrm{n}}_2{\mathrm{O}}_7$is most covalent as it has$\mathrm{M}{\mathrm{n}}^{+7}$.