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Chemical Bonding and Molecular Structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryChemical Bonding and Molecular Structure1 Mark
MCQ
Isostructural species are those which have the same shape and hybridization. Among the given species identify the isostructural pairs.
  • A
    $\big[\text{NF}_3$  and $\text{BF}_3\big]$
  • ✓
    $\big[\text{BF}^–4$ and $\text{NH}^+4\big]$
  • C
    $\big[\text{BCl}_3$ and $\text{BrCl}_3]$
  • D
    $\big[\text{NH}_3$ and $\text{No}^–_3\big]$
✓

Answer

Correct option: B.
$\big[\text{BF}^–4$ and $\text{NH}^+4\big]$
$\mathrm{NF}_3$ is pyramidal whereas $\mathrm{BF}_3$ is planar triangular.
$\mathrm{BF}^{-}{ }_4$ and $\mathrm{NH}_4^{+}$ions both are tetrahedral.
$\mathrm{BCl}_3$ is triangular planar whereas $\mathrm{BrCl}_3$ is pyramidal.
$\mathrm{NH}_3$ is pyramidal whereas $\mathrm{NO}_3$ is triangular planar.

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