Question

Among the members of V A group (N, P, As, S band Bi), which of the following properties shows an increase as we go down from nitrogen to bismuth?

• A. Stability of +3 oxidation state
• B. Reducing character of hybrides
• C. Electronegativity
• D. Acidic nature of the pentoxide

Answer 1

The correct option is A Stability of +3 oxidation state

(1)Among the members of group 15 ,as we move down the group, the stability of +3 oxidation state increases due to inert pair effect pair effect is tendency of two $E^{-}s$ in outmost s orbital to remain unshared this is due to penetration of electron to(n-1)Cl electron and becoming closer to the nuclear.

(2)Reducing character of hydrides of group15 elements increases in the order $N{H}_3<H_3<As{H}_3<sb{H}_3<Bi{H}_3$ this is due to decrease in the thermal stability of hydrides as we move down the group because of increase in the size of the central atom.