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) $SiF_4$ and $SF_4$
(b) $IO_3^{-}$and $XeO_3$
(c) $BH_4^{-}$and $NH_4^{+}$
(d) $PF_6^{-}$and $SF_6$
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Solution:
- (a) $SiF_4$ has symmetrical tetrahedral shape which is due to $s p^{3}$ hybridisation of silicon atom in its excited state while $SF_4$ has distorted tetrahedral or sea-saw geometry which arises due to $s p^{3} d$ hybridisation of sulphur atom and one lone pair of $e^{-} s$ in one of the equatorial hybrid orbital.
