Chemical Bonding and Molecular Structure - Result Question 114

####117. Among the following the pair in which the two species are not isostructural is

[2004]

(a) SiF4 and SF4

(b) IO3and XeO3

(c) BH4and NH4+

(d) PF6and SF6

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Solution:

  1. (a) SiF4 has symmetrical tetrahedral shape which is due to sp3 hybridisation of silicon atom in its excited state while SF4 has distorted tetrahedral or sea-saw geometry which arises due to sp3d hybridisation of sulphur atom and one lone pair of es in one of the equatorial hybrid orbital.


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