[1999]
(a) $CO_3{ }^{2-}$
(b) $SO_3$
(c) $BF_3$
(d) $PF_3$
Correct Answer: 99.(d)
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.
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