JEE Main · 2011 · 10 Apr 2011 · Offline · p-Block Elements

Which of the following statement is wrong ?

(A)Nitrogen cannot form $d π - p π$ bond.
(B)Single $N - N$ bond is weaker than the single $P - P$ bond,
(C) $N_{2} O_{4}$ has two resonance structures
(D)The stability of hydrides increases from $NH_{3}$ to $BiH_{3}$ in group 15 of the periodic table✓ Correct

Answer: (D)

Solution

Going down group 15 the element-hydrogen bond grows longer and weaker as atomic size increases, so the thermal stability of the hydrides falls steadily from

N H_{3}

Bi H_{3}

rather than rising; the statement claiming it increases is therefore the wrong one. The others are sound: nitrogen has no

d

orbitals for

d π - p π

bonding, the

N - N

single bond is weakened by lone-pair repulsion compared with

P - P

, and

N_{2} O_{4}

does have resonance structures.

JEE Main · 2011 · 10 Apr 2011 · Offline · Single correct option

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JEE Main · 2011 · 10 Apr 2011 · Offline · p-Block Elements

Solution

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