Chemical Bonding and Molecular Structure - Result Question 72
####73. Which one of the following has the pyramidal shape?
(a) $CO_3{ }^{2-}$
(b) $SO_3$
(c) $BF_3$
(d) $PF_3$
[1999]
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Solution:
- (d) $PF_3$ has pyramidal shape
Phosphorus exist in $s p^{3}$ hybridiation state hence it exist in tetrahedral geometry. But due to presence of lone pair its shape is pyramidal.
(b) $XeF_4$ hybridisation is $=\frac{1}{2}(V+X-C+A)$ hence $V=8$ (no. of valence $e^{-}$) $X=4$ (no of monovalent atom)
$ \frac{1}{2}(8+4+0-0)=6, s p^{3} d^{2} $
$C=0$ charge on cation
$A=0$ (charge on anion).
The shape is
