Ncert Exercises & Solutions

Among the given species, the isostructural pair is:

1. \( \mathrm{NF}_3 \text { and } \mathrm{BF}_3 \)
2. \(\mathrm{BF}_4^{-} \text {and } \mathrm{NH}_4^{+} \)
3. \(\mathrm{BCl}_3 \text { and } \mathrm{BrCl}_3 \)
4. \(\mathrm{NH}_3 \text { and } \mathrm{NO}_3^{-}\)

HINT: Isostructural species are those which have the same shape and hybridization.

Explanation:

1.) NF₃ is pyramidal whereas BF₃ is trigonal planar. Hence, both have different shapes.

2.)

{BF}_{4}^{-}

and

{NH}_{4}^{+}

ions both are tetrahedral. Both have the same shape and the hybridization is also the same, that is,

{sp}^{3}

3.) BCl₃ is trigonal planar whereas BrCl₃ is trigonal bipyramidal. Both have different same shapes.

4.) NH₃ is pyramidal whereas

{NO}_{3}^{-}

is trigonal planar. Both have different shape.

Hence, option second is the correct answer.

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