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p -Block elements - ll — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Which of the following statement is wrong ?
  • ✓
    The stability of hydride increases from $NH_3$ to $BiH_3$ in group $15$ of the periodic table.
  • B
    Nitrogen cannot form $d\pi - p\pi$ bond.
  • C
    Single $N- N$ bond is weaker than the single $P- P$ bond.
  • D
    $N_2O_4$ has two resonance structures.
✓

Answer

Correct option: A.
The stability of hydride increases from $NH_3$ to $BiH_3$ in group $15$ of the periodic table.
a
The case of formation and stality of hydrides decreases ravidly from to $B H_{3}$. This is evident from their theirsociation temperature which decosses for $N H_{3}$ to $B H_{3} .$ As we group the size of central from thoreases and thus metal- hydrogen bond becomes weaker due to decreased overlap between the large central atom and small hydrogen atom.

Most stable to least stable order

$N H_{3}>P H_{3}>A s H_{3}>S b H_{3}>B i H_{3}$

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