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Q. The decreasing order of bond angles in $BF_{3} , NH_{3} , PF_{3}$ and $I_{3}{^{-}}$ is

JEE MainJEE Main 2018Chemical Bonding and Molecular Structure

Solution:

The shape of the given molecules is as follows:

$BF_3$ : Planar triangle with bond angles of $120^{\circ}$.

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$NH _{3}$ : Trigonal pyramidal with bond angles of $107^{\circ} .$

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$I _{3}^{-}$ : Linear with bond angles $180^{\circ}$.

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$PF _{3}$ : Trigonal pyramidal with bond angles of $97.8^{\circ} .$

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