Which of the following are ionic compounds?

Options

A. `NF_(3)`and`PF_(3)`
B. `PF_(3)`and`AsF_(3)`
C. `AsF_(3)`and`SbF_(3)`
D. `SbF_(3)`and`BiF_(3)`

Answer

4

Explanation

The energy required to produce `E^(5+)` is so immense that it is never formed by any Group `15` element. The compounds formed by these elements in `+5` oxidation state are thus perdominantly covalent
However, in case of `Sb` and `Bi` the sum of the first three ionization enthaipies is just low enough to form `E^(3+)` ions. since `F` is the most electronegative element, it provides an electronegative difference large enough tp permit the formation of ionic bonds. Thus, `SbF_(3)` and `BiF_(3)` and exist as ionic solids.