Select the most ionic and most covalent compounds respectively from the following.
`CrO_5, Mn_2O_7, PbO, P_4O_10,SnO_2`

Options

A. `CrO_5, Mn_2O_7`
B. `PbO, Mn_2O_7`
C. `CrO_5, P_4O_10`
D. `SnO_2, CrO_5`

Answer

B

Explanation

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 , PbO is most ionic because `Pb^(2+)` has less polarising power where as `Mn_2O_7` is most covalent because `Mn^(7+)` has higher polarising power.