Question

Select the correct statement about elements of group 15th.

• A. The order of stability of oxidation state for +3 is $B{i}^{3+}>S{b}^{3+}>A{s}^{3+}$ and for +5 is $B{i}^{5+}<S{b}^{5+}<A{s}^{5+}$
• 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) $3HN{O}_2\to HN{O}_3+H_{2}O\text{ + }2NO$

(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.