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  4. Among the following species which two have trigonal pyramidal shape? (I)NI3(II)I-3 (III)SO2-3(IV)NO-3

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Q. Among the following species which two have trigonal pyramidal shape?
$\left(I\right)NI_{3}\left(II\right)I^{-}_{3}$
$\left(III\right)SO^{2-}_{3}\left(IV\right)NO^{-}_{3}$

AIEEEAIEEE 2012Chemical Bonding and Molecular Structure

Solution:

Correct answer is (a) I and III