Question

Select the correct statement about elements of group 15th.

• A. The order of stability of oxidation state for +3 is $Bi^{3 +}>Sb^{3 +}>As^{3 +}$ and for +5 is $Bi^{5 +} < Sb^{5 +} < As^{5 +}$
• B. In the case of nitrogen, all oxidation states from +1 to +4 tend to disproportionate in acid solution.
• C. There is 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

Answer: (D)

(i) This is due to the inert pair effect in the heavier p-block elements.

(ii) $3HNO_{2} \rightarrow HNO_{3}+ \, H_{2}O\text{ + }2NO$

(iii) This is due to the presence of completely filled d and l or f orbitals in heavier elements.

Covalent radius l pm; N = 70, P = 110, As = 120, Bi = 150.