Question

Select the correct statement about elements of group `15^(th)`
A. The order of stability of oxidation state for +3 is `Bi^(3+) gt Sb^(3+) gt As^(3+)` and for `+5` is `Bi^(5+)lt Sb^(5+) lt As^(5+)`
B. In case of nitrogen , all oxidation state from +1 to +4 tend to disproportionate in acid solution
C. There is a considerable increase in covalent radius from N to P but from As to Bi only a small increase in covalent radius is observed
D. All of these

Answer 1

Correct Answer - D
(A)This is due to the inert pair effect in the heavier p-block elements.
(B)`3HNO_2 to HNO_3+H_2O+2NO`
(C )This is due to the presence of completely filled d and / or f orbitals in heavier elements. Covalent radius/ pm , N=70, P=110, As=120, Sb=140, Bi=150