Which one is most ionic ?

Options

A. `P_(2)O_(5)`
B. `CrO_(3)`
C. MnO
D. `Mn_(2)O_(7)`

Answer

C

Explanation

`P_(2)O_(5)`, being a non-metallic oxide will definitely be more covalent than the other metallic oxides. Further, we know that higher the polarizing power of the cation (higher for higher oxidation state of the similar of size cations) more will be the covalent character. here Mn is +7 O.S. in `Mn_(2)O_(7),Cr ` in 6+ in `CrO_(3)` and Mn in +2 in MnO. so MnO is the most ionic and `Mn_(2)O_(7)` is the most covalent.