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Question

Among the following species, identify the isostructural pairs.
NF3, NO3, BF3, H3O+


A
[NF3, NO3] and [BF3, H3O+]
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B
[NF3, H3O+] and [NO3, BF3]
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C
[NF3, H3O+] and [NF3, BF3]
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D
None of the above
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Solution

The correct option is B [NF3, H3O+] and [NO3, BF3]
Structure of a molecule can be ascertained by knowing the number of hybrid bonds in the molecule. Thus

In NF3: H=12(5+30+0)=4
Thus N in NF3 is sp3 hybridised as 4 orbitals are involved in bonding.

In NO3H=12(5+00+1)=3
Thus N in NO3 is sp2 hybridised as 3 orbitals are involved in bonding.

In BF3H=12(3+30+))=3
Thus B in BF3 is sp2 hybridised as 3 orbitals are involved in bonding.

In H3O+H=12(6+31+0)=4
Thus O in H3O+ is sp3 hybridised as 4 orbitals are involved in bonding.

Thus, isostructural pairs are [NF3, H3O+] and [NO3, BF3]

Chemistry

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