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Question

The geometry of a complex species can be understood from the knowledge of type of hybridisation of orbitals of central atom. The hybridisation of orbitals of central atom in [B(OH)4]− and the geometry of the complex are respectively.

A
sp3, tetrahedral
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B
sp3, square planar
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C
sp3d2, octahedral
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D
dsp3, square planar
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Solution

The correct option is A sp3, tetrahedral
Solution:- (A) sp3, tetrahedral
Boron has di electronic configuration:
1s22s22px12py02pz0
In the excited state, 2s-orbital electrons are impaired and one electron is shifted to a p-orbital. Now, hybridisation occurs between one s- and three p-orbitals to give sp3 hybridisation and tetrahedral geometry.

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