Among the following species, identify the isostructural pairs. NF3, NO3- , BF3, H3O+, HN3 (1996 - 1 Mark)a)[ NF3, NO3- ] and[BF3 , H3O+]b)[NF3, HN3] and[NO3-, BF3]c)[NF3, H3O+]and[NO3-, BF3d)[NF3, H3O+] and[HN3, BF3]Correct answer is option 'C'. Can you explain this answer?

Question

Among the following species, identify the isostructural pairs.  NF3, NO3- , BF3, H3O+, HN3 (1996 - 1 Mark)a)[ NF3, NO3- ] and[BF3 , H3O+]b)[NF3, HN3] and[NO3-, BF3]c)[NF3, H3O+]and[NO3-, BF3d)[NF3, H3O+] and[HN3, BF3]Correct answer is option 'C'. Can you explain this answer?

Accepted Answer

Structure of a molecule can be ascertained by knowing the number of hybrid bonds in the molecule. Thus

In NF₃ :

Thus N in NF₃ is sp³ hybridized as 4 orbitals are involved in bonding.
In NO₃^– :

Thus N in NO₃^– is sp² hybridized as 3 orbitals are involved in bonding

In BF₃ :

Thus B in BF₃ is sp² hybridized and 3 orbitals are involved in bonding

In H₃O⁺:

Thus O in H₃O⁺ is sp³ hybridized as 4 orbitals are involved in bonding.
Thus, isostructural pairs are [NF₃, H₃O⁺] and [ NO₃^-, BF₃]

Answer

Bcoz only in option C , NF3 and H3O+ which have same no of lone pair(1) and hybridization (sp3)are written together and same with NO3- and BF3..

Answer

Explanation:

Isostructural pairs:
Isostructural pairs are the species that have the same number of atoms and the same arrangement of atoms in their molecule or ion. In other words, they have the same molecular geometry.

Identification of isostructural pairs:
To identify the isostructural pairs among the given species, we need to compare their molecular geometries.

1. NF3 (Nitrogen trifluoride):
- It has a trigonal pyramidal shape with three bonding pairs and one lone pair of electrons around the central nitrogen atom.
- The arrangement of atoms in NF3 is: N-F-F-F.

2. NO3- (Nitrate ion):
- It has a trigonal planar shape with three bonding pairs and no lone pairs of electrons around the central nitrogen atom.
- The arrangement of atoms in NO3- is: N-O-O-O.

3. BF3 (Boron trifluoride):
- It has a trigonal planar shape with three bonding pairs and no lone pairs of electrons around the central boron atom.
- The arrangement of atoms in BF3 is: B-F-F-F.

4. H3O+ (Hydronium ion):
- It has a trigonal pyramidal shape with three bonding pairs and one lone pair of electrons around the central oxygen atom.
- The arrangement of atoms in H3O+ is: O-H-H-H.

5. HN3 (Hydrazoic acid):
- It has a linear shape with three bonding pairs and no lone pairs of electrons around the central nitrogen atom.
- The arrangement of atoms in HN3 is: N-N-N.

Conclusion:
By comparing the molecular geometries and arrangements of atoms in the given species, we can conclude that the isostructural pairs are [NF3, H3O ] and [NO3-, BF3]. They have the same number of atoms and the same arrangement of atoms in their molecules or ions.

Top Courses for JEEView all

Physics for JEE Main & Advanced

Chapter-wise Tests for JEE Main & Advanced

Mock Tests for JEE Main and Advanced 2026

Chemistry for JEE Main & Advanced

Mathematics (Maths) for JEE Main & Advanced

Top Courses for JEE

Top Courses for JEE

Related Content

JEE Courses

Mock Test Series

Past Year Papers

Additional Courses

Company