Question

Which of the following statement is wrong ? 

(a) The stability of hydrides increases from NH₃ to BiH₃ in group 15 of the periodic table. 

(b) Nitrogen cannot form dp-pp bond. 

(c) Single N — N bond is weaker than the single P – P bond. 

(d) N₂O₄ has two resonance structure.

Answer 1

(a) : Thermal stability decreases gradually from NH₃ to BiH₃. 

So the stability also decreases. 

Decomposition temperature of the following are as follows:

NH₃ (1300⁰c)

PH₃ (440⁰c)

AsH₃  (280⁰c)

SbH₃ (150⁰c)

BiH₃ (room temp)

The size of the central atom increases from N to Bi therefore, the tendency to form a stable covalent bond with small atom like hydrogen decreases and therefore, stability decreases.