which of the following statement is not correct ?

Options

A. all the group `15` element form two types of oxides: `E_(2)O_(3)` and `E_(2)O_(5)`
B. The oxide in the higher oxidation state of the element is mor acidic than that of lower oxidation state
C. Acidic character of oxides increases on moving down the group
D. Oxides of P, As, Sb and Bi exist as the dimmers.

Answer

3

Explanation

The acids character of the oxides decreases (or the basic nature of the oxides increases) with increasesing atomic number. Thus oxides of the types `E_(2)O_(3)`of `N` and `P` are purely acidic,that of `As` and `Sb`are amphoteric and `Bi(III)`oxide is distinctly basic.
`Bi_(2)O_(3)` dissolves in acids to give salt:
`Bi_(2)O_(3)+6HNO_(3)rarr2Bi(NO_(3))_(3)+3H_(2)O`
Among group `15` elements,`Bi` alone forms a stable nitrate, sulphate or carbonate and thus behave like a metal.
The reluctance of `P, As, Sb` and `Bi` to enter into `p pi-p pi` multiple bonding leads to cage structures for their oxides and the exist as the dimers `E_(4)O_(6)` and `E_(4)O_(10)`. Bi (V)oxide is unstabel.