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  4. According to the VSEPR theory, the shape of ClO3- would be

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Q. According to the VSEPR theory, the shape of $ClO_3^{-}$ would be

KEAMKEAM 2019

Solution:

According to VSEPR theory, the shape of a molecule depends upon the number of valence shell electron pairs around the central atom. Pairs of electrons in the valence shell repel each other. The order of their repulsions is

$l p-l p>l p-b p>b p-b p$

The geometry of $ClO _{3}^{-}$ is tetrahedron but due to the presence of $l p-b p$ repulsion, the structure changes to pyramidal shape.

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