####21. The species having pyramidal shape is
(a) $SO _3$
(b) $BrF _3$
(c) $SiO _3^{2-}$
(d) $OSF _2$
Correct Answer: 21. (d)
Solution:
$SO _3$ is planar ( $S$ is $s p^{2}$-hybridised), $BrF _3$ is T-shaped and $SiO _3^{2-}$ is planar ( $Si$ is $s p^{2}$-hybridised).
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