Arrange the oxides of group `15` elements in decreasing order of their acidity

Options

A. `N_(2)O_(5) gt P_(2)O_(5) gt As_(2)O_(5) gt Sb_(2)O_(5) gt Bi_(2)O_(5)`
B. `Bi_(2)O_(5) gt Sb_(2)O_(5) gt As_(2)O_(5) gt P_(2)O_(5) gt N_(2)O_(2)`
C. `P_(2) O_(5) gt N_(2)O_(5) gt As_(2)O_(5) gt Sb_(2)O_(5) gt Bi_(2)O_(5)`
D. `N_(2)O_(5) gt Bi_(2)O_(5) gt P_(2)O_(5) gt As_(2)O_(5) gt Sb_(2)O_(5)`

Answer

A

Explanation

All the oxides of nitrogen (expect NO and `N_(2)O "neutral oxides")` and phosphorus are strongly acidic in nature , oxides of arsenic are weakly acidicl oxides of antimony are amphoteric and those of bismuth are weakly basic.
As the the size of nitrogen atom is small and it has a more strong positive field, so it interacts with water, more strongly pulling the electron pairs between O-H and thus helps in hte release of `H^(+)` ions. However, this tendency diminishes with the increases in size and therefore, decreases the acidic character or conversely increases the basic character.