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Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?

1. [BCl3 and BrCl3]
2. [NH3 and NO3−]
3. [NF3 and BF3]
4. [BF4− and NH4+]

Correct answer: [BF4− and NH4+]

Solution

BF4− and NH4+ are isostructural as both have tetrahedral geometry and sp3 hybridization.

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